64651765 has 32 divisors (see below), whose sum is σ = 86003424. Its totient is φ = 46448640.

The previous prime is 64651739. The next prime is 64651789. The reversal of 64651765 is 56715646.

It can be written as a sum of positive squares in 16 ways, for example, as 15413476 + 49238289 = 3926^2 + 7017^2 .

It is not a de Polignac number, because 64651765 - 2⁵ = 64651733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191677 + ... + 192013.

It is an arithmetic number, because the mean of its divisors is an integer number (2687607).

Almost surely, 2^64651765 is an apocalyptic number.

It is an amenable number.

64651765 is a deficient number, since it is larger than the sum of its proper divisors (21351659).

64651765 is a wasteful number, since it uses less digits than its factorization.

64651765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457.

The product of its digits is 151200, while the sum is 40.

The square root of 64651765 is about 8040.6321268915. The cubic root of 64651765 is about 401.3532603034.

The spelling of 64651765 in words is "sixty-four million, six hundred fifty-one thousand, seven hundred sixty-five".