56487881 has 4 divisors (see below), whose sum is σ = 56618772. Its totient is φ = 56356992.

The previous prime is 56487841. The next prime is 56487883. The reversal of 56487881 is 18878465.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28302400 + 28185481 = 5320^2 + 5309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56487881 is a prime.

It is a super-2 number, since 2×56487881² = 6381761399740322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56487883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64796 + ... + 65661.

It is an arithmetic number, because the mean of its divisors is an integer number (14154693).

Almost surely, 2^56487881 is an apocalyptic number.

It is an amenable number.

56487881 is a deficient number, since it is larger than the sum of its proper divisors (130891).

56487881 is a wasteful number, since it uses less digits than its factorization.

56487881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130890.

The product of its digits is 430080, while the sum is 47.

The square root of 56487881 is about 7515.8420020647. The cubic root of 56487881 is about 383.6940764564.

The spelling of 56487881 in words is "fifty-six million, four hundred eighty-seven thousand, eight hundred eighty-one".