61334140 has 48 divisors (see below), whose sum is σ = 148542912. Its totient is φ = 20837376.

The previous prime is 61334137. The next prime is 61334149. The reversal of 61334140 is 4143316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61334149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13882 + ... + 17758.

It is an arithmetic number, because the mean of its divisors is an integer number (3094644).

Almost surely, 2^61334140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61334140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74271456).

61334140 is an abundant number, since it is smaller than the sum of its proper divisors (87208772).

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

61334140 is a wasteful number, since it uses less digits than its factorization.

61334140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006 (or 4004 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 61334140 is about 7831.6115838313. The cubic root of 61334140 is about 394.3671755601.

Adding to 61334140 its reverse (4143316), we get a palindrome (65477456).

The spelling of 61334140 in words is "sixty-one million, three hundred thirty-four thousand, one hundred forty".