64646465 has 8 divisors (see below), whose sum is σ = 83543208. Its totient is φ = 47738880.

The previous prime is 64646453. The next prime is 64646473. The reversal of 64646465 is 56464646.

It can be written as a sum of positive squares in 4 ways, for example, as 8111104 + 56535361 = 2848^2 + 7519^2 .

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

It is not a de Polignac number, because 64646465 - 2⁶ = 64646401 is a prime.

It is a Duffinian number.

It is a Curzon 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, 497216 + ... + 497345.

It is an arithmetic number, because the mean of its divisors is an integer number (10442901).

Almost surely, 2^64646465 is an apocalyptic number.

64646465 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64646465 is a deficient number, since it is larger than the sum of its proper divisors (18896743).

64646465 is a wasteful number, since it uses less digits than its factorization.

64646465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994579.

The product of its digits is 414720, while the sum is 41.

The square root of 64646465 is about 8040.3025440589. The cubic root of 64646465 is about 401.3422926708.

The spelling of 64646465 in words is "sixty-four million, six hundred forty-six thousand, four hundred sixty-five".