64138765 has 8 divisors (see below), whose sum is σ = 78115680. Its totient is φ = 50544912.

The previous prime is 64138759. The next prime is 64138777. The reversal of 64138765 is 56783146.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64138765 - 2⁵ = 64138733 is a prime.

It is a super-2 number, since 2×64138765² = 8227562351450450, which contains 22 as substring.

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, 95395 + ... + 96064.

It is an arithmetic number, because the mean of its divisors is an integer number (9764460).

Almost surely, 2^64138765 is an apocalyptic number.

It is an amenable number.

64138765 is a deficient number, since it is larger than the sum of its proper divisors (13976915).

64138765 is a wasteful number, since it uses less digits than its factorization.

64138765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191531.

The product of its digits is 120960, while the sum is 40.

The square root of 64138765 is about 8008.6681164848. The cubic root of 64138765 is about 400.2888850633.

The spelling of 64138765 in words is "sixty-four million, one hundred thirty-eight thousand, seven hundred sixty-five".