64663790 has 16 divisors (see below), whose sum is σ = 119541312. Its totient is φ = 25166304.

The previous prime is 64663771. The next prime is 64663811. The reversal of 64663790 is 9736646.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87014 + ... + 87753.

It is an arithmetic number, because the mean of its divisors is an integer number (7471332).

Almost surely, 2^64663790 is an apocalyptic number.

64663790 is a deficient number, since it is larger than the sum of its proper divisors (54877522).

64663790 is a wasteful number, since it uses less digits than its factorization.

64663790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174811.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 64663790 is about 8041.3798567161. The cubic root of 64663790 is about 401.3781421905.

The spelling of 64663790 in words is "sixty-four million, six hundred sixty-three thousand, seven hundred ninety".