64763890 has 16 divisors (see below), whose sum is σ = 117666432. Its totient is φ = 25663024.

The previous prime is 64763869. The next prime is 64763903. The reversal of 64763890 is 9836746.

It is a happy number.

It is a super-2 number, since 2×64763890² = 8388722895864200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29194 + ... + 31333.

It is an arithmetic number, because the mean of its divisors is an integer number (7354152).

Almost surely, 2^64763890 is an apocalyptic number.

64763890 is a deficient number, since it is larger than the sum of its proper divisors (52902542).

64763890 is a wasteful number, since it uses less digits than its factorization.

64763890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60641.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 64763890 is about 8047.6015060389. The cubic root of 64763890 is about 401.5851474708.

The spelling of 64763890 in words is "sixty-four million, seven hundred sixty-three thousand, eight hundred ninety".