56509990 has 16 divisors (see below), whose sum is σ = 107071920. Its totient is φ = 21414240.

The previous prime is 56509987. The next prime is 56509997. The reversal of 56509990 is 9990565.

It is a happy number.

56509990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56509997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148521 + ... + 148900.

It is an arithmetic number, because the mean of its divisors is an integer number (6691995).

Almost surely, 2^56509990 is an apocalyptic number.

56509990 is a deficient number, since it is larger than the sum of its proper divisors (50561930).

56509990 is a wasteful number, since it uses less digits than its factorization.

56509990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297447.

The product of its (nonzero) digits is 109350, while the sum is 43.

The square root of 56509990 is about 7517.3126847298. The cubic root of 56509990 is about 383.7441284067.

The spelling of 56509990 in words is "fifty-six million, five hundred nine thousand, nine hundred ninety".