61520864 has 24 divisors (see below), whose sum is σ = 125028288. Its totient is φ = 29767680.

The previous prime is 61520843. The next prime is 61520867. The reversal of 61520864 is 46802516.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 61520864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61520867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30017 + ... + 32000.

It is an arithmetic number, because the mean of its divisors is an integer number (5209512).

Almost surely, 2^61520864 is an apocalyptic number.

It is an amenable number.

61520864 is an abundant number, since it is smaller than the sum of its proper divisors (63507424).

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

61520864 is a wasteful number, since it uses less digits than its factorization.

61520864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62058 (or 62050 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 61520864 is about 7843.5236979307. The cubic root of 61520864 is about 394.7669703869.

The spelling of 61520864 in words is "sixty-one million, five hundred twenty thousand, eight hundred sixty-four".