75221664 has 72 divisors (see below), whose sum is σ = 229709088. Its totient is φ = 21490560.

The previous prime is 75221659. The next prime is 75221687. The reversal of 75221664 is 46612257.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3292 + ... + 12699.

It is an arithmetic number, because the mean of its divisors is an integer number (3190404).

Almost surely, 2^75221664 is an apocalyptic number.

It is an amenable number.

75221664 is an abundant number, since it is smaller than the sum of its proper divisors (154487424).

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

75221664 is a wasteful number, since it uses less digits than its factorization.

75221664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16018 (or 16003 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 75221664 is about 8673.0423727778. The cubic root of 75221664 is about 422.1313877030.

The spelling of 75221664 in words is "seventy-five million, two hundred twenty-one thousand, six hundred sixty-four".