45681664 has 44 divisors (see below), whose sum is σ = 104380624. Its totient is φ = 19574784.

The previous prime is 45681659. The next prime is 45681677. The reversal of 45681664 is 46618654.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3982 + ... + 10354.

Almost surely, 2^45681664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45681664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52190312).

45681664 is an abundant number, since it is smaller than the sum of its proper divisors (58698960).

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

45681664 is an equidigital number, since it uses as much as digits as its factorization.

45681664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6400 (or 6382 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 45681664 is about 6758.8211989962. The cubic root of 45681664 is about 357.4763418579.

The spelling of 45681664 in words is "forty-five million, six hundred eighty-one thousand, six hundred sixty-four".