72447740 has 24 divisors (see below), whose sum is σ = 154069440. Its totient is φ = 28611648.

The previous prime is 72447737. The next prime is 72447757. The reversal of 72447740 is 4774427.

It is a super-2 number, since 2×72447740² = 10497350062215200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72447740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21347 + ... + 24506.

It is an arithmetic number, because the mean of its divisors is an integer number (6419560).

Almost surely, 2^72447740 is an apocalyptic number.

It is an amenable number.

72447740 is an abundant number, since it is smaller than the sum of its proper divisors (81621700).

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

72447740 is a wasteful number, since it uses less digits than its factorization.

72447740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45941 (or 45939 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 35.

The square root of 72447740 is about 8511.6238168754. The cubic root of 72447740 is about 416.8773320481.

The spelling of 72447740 in words is "seventy-two million, four hundred forty-seven thousand, seven hundred forty".