75221280 has 72 divisors (see below), whose sum is σ = 256697532. Its totient is φ = 20058624.

The previous prime is 75221249. The next prime is 75221299. The reversal of 75221280 is 8212257.

It can be written as a sum of positive squares in 2 ways, for example, as 74028816 + 1192464 = 8604^2 + 1092^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24679 + ... + 27558.

Almost surely, 2^75221280 is an apocalyptic number.

It is an amenable number.

75221280 is an abundant number, since it is smaller than the sum of its proper divisors (181476252).

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

75221280 is a wasteful number, since it uses less digits than its factorization.

75221280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52258 (or 52247 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 75221280 is about 8673.0202351891. The cubic root of 75221280 is about 422.1306693872.

The spelling of 75221280 in words is "seventy-five million, two hundred twenty-one thousand, two hundred eighty".