61522140 has 96 divisors (see below), whose sum is σ = 179081280. Its totient is φ = 15769600.

The previous prime is 61522129. The next prime is 61522141. The reversal of 61522140 is 4122516.

61522140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61522141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218800 + ... + 219080.

It is an arithmetic number, because the mean of its divisors is an integer number (1865430).

Almost surely, 2^61522140 is an apocalyptic number.

61522140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61522140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89540640).

61522140 is an abundant number, since it is smaller than the sum of its proper divisors (117559140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61522140 is a wasteful number, since it uses less digits than its factorization.

61522140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 61522140 is about 7843.6050385011. The cubic root of 61522140 is about 394.7696996462.

Adding to 61522140 its reverse (4122516), we get a palindrome (65644656).

It can be divided in two parts, 615 and 22140, that multiplied together give a square (13616100 = 3690²).

The spelling of 61522140 in words is "sixty-one million, five hundred twenty-two thousand, one hundred forty".