56999999 has 4 divisors (see below), whose sum is σ = 65142864. Its totient is φ = 48857136.

The previous prime is 56999989. The next prime is 57000011. The reversal of 56999999 is 99999965.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56999999 - 2⁸ = 56999743 is a prime.

It is a Duffinian number.

56999999 is a modest number, since divided by 9999 gives 5699 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56999989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4071422 + ... + 4071435.

It is an arithmetic number, because the mean of its divisors is an integer number (16285716).

Almost surely, 2^56999999 is an apocalyptic number.

56999999 is a deficient number, since it is larger than the sum of its proper divisors (8142865).

56999999 is an equidigital number, since it uses as much as digits as its factorization.

56999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8142864.

The product of its digits is 15943230, while the sum is 65.

The square root of 56999999 is about 7549.8343690441. The cubic root of 56999999 is about 384.8501108771.

The spelling of 56999999 in words is "fifty-six million, nine hundred ninety-nine thousand, nine hundred ninety-nine".