61657056 has 36 divisors (see below), whose sum is σ = 175338072. Its totient is φ = 20552256.

The previous prime is 61657019. The next prime is 61657081. The reversal of 61657056 is 65075616.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 61657056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106756 + ... + 107331.

It is an arithmetic number, because the mean of its divisors is an integer number (4870502).

Almost surely, 2^61657056 is an apocalyptic number.

It is an amenable number.

61657056 is an abundant number, since it is smaller than the sum of its proper divisors (113681016).

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

61657056 is a wasteful number, since it uses less digits than its factorization.

61657056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214103 (or 214092 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 61657056 is about 7852.2007106288. The cubic root of 61657056 is about 395.0580612189.

The spelling of 61657056 in words is "sixty-one million, six hundred fifty-seven thousand, fifty-six".