72921760 has 24 divisors (see below), whose sum is σ = 172278036. Its totient is φ = 29168640.

The previous prime is 72921733. The next prime is 72921767. The reversal of 72921760 is 6712927.

It can be written as a sum of positive squares in 2 ways, for example, as 72795024 + 126736 = 8532^2 + 356^2 .

It is not an unprimeable number, because it can be changed into a prime (72921767) 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, 227721 + ... + 228040.

Almost surely, 2^72921760 is an apocalyptic number.

It is an amenable number.

72921760 is an abundant number, since it is smaller than the sum of its proper divisors (99356276).

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

72921760 is a wasteful number, since it uses less digits than its factorization.

72921760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455776 (or 455768 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 72921760 is about 8539.4238681541. The cubic root of 72921760 is about 417.7845550768.

The spelling of 72921760 in words is "seventy-two million, nine hundred twenty-one thousand, seven hundred sixty".