73445664 has 24 divisors (see below), whose sum is σ = 192795120. Its totient is φ = 24481856.

The previous prime is 73445663. The next prime is 73445683. The reversal of 73445664 is 46654437.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (73445663) 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, 382434 + ... + 382625.

It is an arithmetic number, because the mean of its divisors is an integer number (8033130).

Almost surely, 2^73445664 is an apocalyptic number.

It is an amenable number.

73445664 is an abundant number, since it is smaller than the sum of its proper divisors (119349456).

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

73445664 is a wasteful number, since it uses less digits than its factorization.

73445664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765072 (or 765064 counting only the distinct ones).

The product of its digits is 241920, while the sum is 39.

The square root of 73445664 is about 8570.0445739798. The cubic root of 73445664 is about 418.7826883519.

The spelling of 73445664 in words is "seventy-three million, four hundred forty-five thousand, six hundred sixty-four".