64803993 has 16 divisors (see below), whose sum is σ = 87829056. Its totient is φ = 42495680.

The previous prime is 64803961. The next prime is 64804049. The reversal of 64803993 is 39930846.

It is a cyclic number.

It is not a de Polignac number, because 64803993 - 2⁵ = 64803961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64803943) 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, 78523 + ... + 79343.

It is an arithmetic number, because the mean of its divisors is an integer number (5489316).

Almost surely, 2^64803993 is an apocalyptic number.

It is an amenable number.

64803993 is a deficient number, since it is larger than the sum of its proper divisors (23025063).

64803993 is a wasteful number, since it uses less digits than its factorization.

64803993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 64803993 is about 8050.0927323851. The cubic root of 64803993 is about 401.6680200211.

The spelling of 64803993 in words is "sixty-four million, eight hundred three thousand, nine hundred ninety-three".