56989999 has 16 divisors (see below), whose sum is σ = 64333440. Its totient is φ = 50038560.

The previous prime is 56989979. The next prime is 56990039. The reversal of 56989999 is 99998965.

It is not a de Polignac number, because 56989999 - 2⁷ = 56989871 is a prime.

It is a Duffinian number.

56989999 is a modest number, since divided by 9999 gives 5698 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 56989999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56989909) 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, 38332 + ... + 39790.

It is an arithmetic number, because the mean of its divisors is an integer number (4020840).

Almost surely, 2^56989999 is an apocalyptic number.

56989999 is a deficient number, since it is larger than the sum of its proper divisors (7343441).

56989999 is a wasteful number, since it uses less digits than its factorization.

56989999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590.

The product of its digits is 14171760, while the sum is 64.

The square root of 56989999 is about 7549.1720738105. The cubic root of 56989999 is about 384.8276037060.

The spelling of 56989999 in words is "fifty-six million, nine hundred eighty-nine thousand, nine hundred ninety-nine".