56780665 has 8 divisors (see below), whose sum is σ = 68902920. Its totient is φ = 44913792.

The previous prime is 56780657. The next prime is 56780729. The reversal of 56780665 is 56608765.

It can be written as a sum of positive squares in 4 ways, for example, as 2493241 + 54287424 = 1579^2 + 7368^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56780665 - 2³ = 56780657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63354 + ... + 64243.

It is an arithmetic number, because the mean of its divisors is an integer number (8612865).

Almost surely, 2^56780665 is an apocalyptic number.

It is an amenable number.

56780665 is a deficient number, since it is larger than the sum of its proper divisors (12122255).

56780665 is a wasteful number, since it uses less digits than its factorization.

56780665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127691.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 56780665 is about 7535.2946193231. The cubic root of 56780665 is about 384.3558464468.

The spelling of 56780665 in words is "fifty-six million, seven hundred eighty thousand, six hundred sixty-five".