64612665 has 96 divisors (see below), whose sum is σ = 130908960. Its totient is φ = 29196288.

The previous prime is 64612663. The next prime is 64612697. The reversal of 64612665 is 56621646.

It is a happy number.

64612665 is a `hidden beast` number, since 646 + 1 + 2 + 6 + 6 + 5 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 23242041 + 41370624 = 4821^2 + 6432^2 .

It is not a de Polignac number, because 64612665 - 2¹ = 64612663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64612661) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 725941 + ... + 726029.

It is an arithmetic number, because the mean of its divisors is an integer number (1363635).

Almost surely, 2^64612665 is an apocalyptic number.

64612665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64612665 is an abundant number, since it is smaller than the sum of its proper divisors (66296295).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64612665 is a wasteful number, since it uses less digits than its factorization.

64612665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 200 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 64612665 is about 8038.2003582892. The cubic root of 64612665 is about 401.2723340409.

The spelling of 64612665 in words is "sixty-four million, six hundred twelve thousand, six hundred sixty-five".