72780012 has 48 divisors (see below), whose sum is σ = 189379680. Its totient is φ = 24171264.

The previous prime is 72779969. The next prime is 72780047. The reversal of 72780012 is 21008727.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32728 + ... + 34880.

It is an arithmetic number, because the mean of its divisors is an integer number (3945410).

Almost surely, 2^72780012 is an apocalyptic number.

It is an amenable number.

72780012 is an abundant number, since it is smaller than the sum of its proper divisors (116599668).

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

72780012 is a wasteful number, since it uses less digits than its factorization.

72780012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479 (or 2471 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 72780012 is about 8531.1202078039. The cubic root of 72780012 is about 417.5136778241.

Adding to 72780012 its reverse (21008727), we get a palindrome (93788739).

The spelling of 72780012 in words is "seventy-two million, seven hundred eighty thousand, twelve".