73681664 has 36 divisors (see below), whose sum is σ = 168090384. Its totient is φ = 31577088.

The previous prime is 73681649. The next prime is 73681667. The reversal of 73681664 is 46618637.

It is not an unprimeable number, because it can be changed into a prime (73681667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18767 + ... + 22350.

Almost surely, 2^73681664 is an apocalyptic number.

It is an amenable number.

73681664 is an abundant number, since it is smaller than the sum of its proper divisors (94408720).

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

73681664 is an equidigital number, since it uses as much as digits as its factorization.

73681664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41140 (or 41126 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 73681664 is about 8583.8024208389. The cubic root of 73681664 is about 419.2307612957.

The spelling of 73681664 in words is "seventy-three million, six hundred eighty-one thousand, six hundred sixty-four".