64990893 has 16 divisors (see below), whose sum is σ = 98643456. Its totient is φ = 37675440.

The previous prime is 64990867. The next prime is 64990903. The reversal of 64990893 is 39809946.

It is a happy number.

It is not a de Polignac number, because 64990893 - 2⁶ = 64990829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64990823) 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, 42055 + ... + 43572.

It is an arithmetic number, because the mean of its divisors is an integer number (6165216).

Almost surely, 2^64990893 is an apocalyptic number.

It is an amenable number.

64990893 is a deficient number, since it is larger than the sum of its proper divisors (33652563).

64990893 is a wasteful number, since it uses less digits than its factorization.

64990893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85664.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 64990893 is about 8061.6929363503. The cubic root of 64990893 is about 402.0537971616.

The spelling of 64990893 in words is "sixty-four million, nine hundred ninety thousand, eight hundred ninety-three".