72921740 has 24 divisors (see below), whose sum is σ = 155077440. Its totient is φ = 28798848.

The previous prime is 72921733. The next prime is 72921767. The reversal of 72921740 is 4712927.

It is a junction number, because it is equal to n+sod(n) for n = 72921697 and 72921706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21497 + ... + 24656.

It is an arithmetic number, because the mean of its divisors is an integer number (6461560).

Almost surely, 2^72921740 is an apocalyptic number.

It is an amenable number.

72921740 is an abundant number, since it is smaller than the sum of its proper divisors (82155700).

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

72921740 is a wasteful number, since it uses less digits than its factorization.

72921740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46241 (or 46239 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 72921740 is about 8539.4226971148. The cubic root of 72921740 is about 417.7845168820.

The spelling of 72921740 in words is "seventy-two million, nine hundred twenty-one thousand, seven hundred forty".