61245720 has 96 divisors (see below), whose sum is σ = 206453520. Its totient is φ = 16329600.

The previous prime is 61245719. The next prime is 61245727. The reversal of 61245720 is 2754216.

61245720 is a `hidden beast` number, since 612 + 45 + 7 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61245727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6570 + ... + 12870.

Almost surely, 2^61245720 is an apocalyptic number.

61245720 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 61245720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103226760).

61245720 is an abundant number, since it is smaller than the sum of its proper divisors (145207800).

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

61245720 is a wasteful number, since it uses less digits than its factorization.

61245720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6327 (or 6311 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 61245720 is about 7825.9644773025. The cubic root of 61245720 is about 394.1775763396.

Adding to 61245720 its reverse (2754216), we get a palindrome (63999936).

The spelling of 61245720 in words is "sixty-one million, two hundred forty-five thousand, seven hundred twenty".