64581965 has 8 divisors (see below), whose sum is σ = 88569600. Its totient is φ = 44284752.

The previous prime is 64581961. The next prime is 64581971. The reversal of 64581965 is 56918546.

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 64581965 - 2² = 64581961 is a prime.

It is a super-2 number, since 2×64581965² = 8341660406522450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64581961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922565 + ... + 922634.

It is an arithmetic number, because the mean of its divisors is an integer number (11071200).

Almost surely, 2^64581965 is an apocalyptic number.

It is an amenable number.

64581965 is a deficient number, since it is larger than the sum of its proper divisors (23987635).

64581965 is a wasteful number, since it uses less digits than its factorization.

64581965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845211.

The product of its digits is 259200, while the sum is 44.

The square root of 64581965 is about 8036.2904999757. The cubic root of 64581965 is about 401.2087705880.

The spelling of 64581965 in words is "sixty-four million, five hundred eighty-one thousand, nine hundred sixty-five".