56221728829 has 12 divisors (see below), whose sum is σ = 65498003004. Its totient is φ = 48118420224.

The previous prime is 56221728817. The next prime is 56221728877. The reversal of 56221728829 is 92882712265.

It can be written as a sum of positive squares in 2 ways, for example, as 28898300025 + 27323428804 = 169995^2 + 165298^2 .

It is not a de Polignac number, because 56221728829 - 2⁹ = 56221728317 is a prime.

It is a super-2 number, since 2×56221728829² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56221728809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 819462 + ... + 885415.

It is an arithmetic number, because the mean of its divisors is an integer number (5458166917).

Almost surely, 2^56221728829 is an apocalyptic number.

It is an amenable number.

56221728829 is a deficient number, since it is larger than the sum of its proper divisors (9276274175).

56221728829 is a wasteful number, since it uses less digits than its factorization.

56221728829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705564 (or 1705557 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 56221728829 in words is "fifty-six billion, two hundred twenty-one million, seven hundred twenty-eight thousand, eight hundred twenty-nine".