56761881 has 8 divisors (see below), whose sum is σ = 82562784. Its totient is φ = 34401120.

The previous prime is 56761877. The next prime is 56761909. The reversal of 56761881 is 18816765.

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

It is not a de Polignac number, because 56761881 - 2² = 56761877 is a prime.

It is a super-2 number, since 2×56761881² = 6443822269316322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56761841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 859996 + ... + 860061.

It is an arithmetic number, because the mean of its divisors is an integer number (10320348).

Almost surely, 2^56761881 is an apocalyptic number.

It is an amenable number.

56761881 is a deficient number, since it is larger than the sum of its proper divisors (25800903).

56761881 is a wasteful number, since it uses less digits than its factorization.

56761881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720071.

The product of its digits is 80640, while the sum is 42.

The square root of 56761881 is about 7534.0481150574. The cubic root of 56761881 is about 384.3134579771.

Subtracting from 56761881 its reverse (18816765), we obtain a triangular number (37945116 = T₈₇₁₁).

It can be divided in two parts, 5676 and 1881, that added together give a palindrome (7557).

The spelling of 56761881 in words is "fifty-six million, seven hundred sixty-one thousand, eight hundred eighty-one".