56780664 has 64 divisors (see below), whose sum is σ = 150336000. Its totient is φ = 17821440.

The previous prime is 56780657. The next prime is 56780729. The reversal of 56780664 is 46608765.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108724 + ... + 109244.

It is an arithmetic number, because the mean of its divisors is an integer number (2349000).

Almost surely, 2^56780664 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 56780664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75168000).

56780664 is an abundant number, since it is smaller than the sum of its proper divisors (93555336).

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

56780664 is a wasteful number, since it uses less digits than its factorization.

56780664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 56780664 is about 7535.2945529687. The cubic root of 56780664 is about 384.3558441904.

The spelling of 56780664 in words is "fifty-six million, seven hundred eighty thousand, six hundred sixty-four".