56212781 has 8 divisors (see below), whose sum is σ = 58106400. Its totient is φ = 54350640.

The previous prime is 56212757. The next prime is 56212789. The reversal of 56212781 is 18721265.

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 56212781 - 2¹⁸ = 55950637 is a prime.

It is a super-2 number, since 2×56212781² = 6319753495507922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56212789) 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, 4211 + ... + 11408.

It is an arithmetic number, because the mean of its divisors is an integer number (7263300).

Almost surely, 2^56212781 is an apocalyptic number.

It is an amenable number.

56212781 is a deficient number, since it is larger than the sum of its proper divisors (1893619).

56212781 is a wasteful number, since it uses less digits than its factorization.

56212781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15739.

The product of its digits is 6720, while the sum is 32.

The square root of 56212781 is about 7497.5183227519. The cubic root of 56212781 is about 383.0701900823.

The spelling of 56212781 in words is "fifty-six million, two hundred twelve thousand, seven hundred eighty-one".