56781257 has 8 divisors (see below), whose sum is σ = 61691784. Its totient is φ = 51948288.

The previous prime is 56781229. The next prime is 56781259. The reversal of 56781257 is 75218765.

56781257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7557001 + 49224256 = 2749^2 + 7016^2 .

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 56781257 - 2⁸ = 56781001 is a prime.

It is a super-2 number, since 2×56781257² = 6448222293000098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56781259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17858 + ... + 20795.

It is an arithmetic number, because the mean of its divisors is an integer number (7711473).

Almost surely, 2^56781257 is an apocalyptic number.

It is an amenable number.

56781257 is a deficient number, since it is larger than the sum of its proper divisors (4910527).

56781257 is a wasteful number, since it uses less digits than its factorization.

56781257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38779.

The product of its digits is 117600, while the sum is 41.

The square root of 56781257 is about 7535.3339010292. Note that the first 3 decimals coincide. The cubic root of 56781257 is about 384.3571822177.

The spelling of 56781257 in words is "fifty-six million, seven hundred eighty-one thousand, two hundred fifty-seven".