64999999 has 8 divisors (see below), whose sum is σ = 65670192. Its totient is φ = 64333440.

The previous prime is 64999981. The next prime is 65000011. The reversal of 64999999 is 99999946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64999999 - 2⁷ = 64999871 is a prime.

It is a Duffinian number.

64999999 is a modest number, since divided by 9999 gives 6499 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 64999999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64999939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47079 + ... + 48439.

It is an arithmetic number, because the mean of its divisors is an integer number (8208774).

Almost surely, 2^64999999 is an apocalyptic number.

64999999 is a deficient number, since it is larger than the sum of its proper divisors (670193).

64999999 is a wasteful number, since it uses less digits than its factorization.

64999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817.

The product of its digits is 12754584, while the sum is 64.

The square root of 64999999 is about 8062.2576862812. The cubic root of 64999999 is about 402.0725737970.

It can be divided in two parts, 64 and 999999, that multiplied together give a palindrome (63999936).

The spelling of 64999999 in words is "sixty-four million, nine hundred ninety-nine thousand, nine hundred ninety-nine".