556290721 has 16 divisors (see below), whose sum is σ = 673509760. Its totient is φ = 448830720.

The previous prime is 556290697. The next prime is 556290727. The reversal of 556290721 is 127092655.

It is a cyclic number.

It is not a de Polignac number, because 556290721 - 2⁷ = 556290593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (556290727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7561 + ... + 34201.

It is an arithmetic number, because the mean of its divisors is an integer number (42094360).

Almost surely, 2^556290721 is an apocalyptic number.

It is an amenable number.

556290721 is a deficient number, since it is larger than the sum of its proper divisors (117219039).

556290721 is a wasteful number, since it uses less digits than its factorization.

556290721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26824.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 556290721 is about 23585.8160978161. The cubic root of 556290721 is about 822.4331463910.

The spelling of 556290721 in words is "five hundred fifty-six million, two hundred ninety thousand, seven hundred twenty-one".