72780272 has 20 divisors (see below), whose sum is σ = 141162840. Its totient is φ = 36351168.

The previous prime is 72780263. The next prime is 72780283. The reversal of 72780272 is 27208727.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18338 + ... + 21950.

It is an arithmetic number, because the mean of its divisors is an integer number (7058142).

Almost surely, 2^72780272 is an apocalyptic number.

It is an amenable number.

72780272 is a deficient number, since it is larger than the sum of its proper divisors (68382568).

72780272 is a wasteful number, since it uses less digits than its factorization.

72780272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4880 (or 4874 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 72780272 is about 8531.1354461174. The cubic root of 72780272 is about 417.5141750001.

Adding to 72780272 its reverse (27208727), we get a palindrome (99988999).

The spelling of 72780272 in words is "seventy-two million, seven hundred eighty thousand, two hundred seventy-two".