64808939 has 16 divisors (see below), whose sum is σ = 72945600. Its totient is φ = 57165696.

The previous prime is 64808923. The next prime is 64808957. The reversal of 64808939 is 93980846.

It is a cyclic number.

It is not a de Polignac number, because 64808939 - 2⁴ = 64808923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64808893 and 64808902.

It is not an unprimeable number, because it can be changed into a prime (64808959) 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 15 ways as a sum of consecutive naturals, for example, 37997 + ... + 39665.

It is an arithmetic number, because the mean of its divisors is an integer number (4559100).

Almost surely, 2^64808939 is an apocalyptic number.

64808939 is a deficient number, since it is larger than the sum of its proper divisors (8136661).

64808939 is a wasteful number, since it uses less digits than its factorization.

64808939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 64808939 is about 8050.3999279539. The cubic root of 64808939 is about 401.6782385246.

The spelling of 64808939 in words is "sixty-four million, eight hundred eight thousand, nine hundred thirty-nine".