72780396 has 48 divisors (see below), whose sum is σ = 185488128. Its totient is φ = 22075200.

The previous prime is 72780353. The next prime is 72780403. The reversal of 72780396 is 69308727.

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, 7791 + ... + 14361.

It is an arithmetic number, because the mean of its divisors is an integer number (3864336).

Almost surely, 2^72780396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72780396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92744064).

72780396 is an abundant number, since it is smaller than the sum of its proper divisors (112707732).

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

72780396 is a wasteful number, since it uses less digits than its factorization.

72780396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662 (or 6660 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 72780396 is about 8531.1427136111. The cubic root of 72780396 is about 417.5144121144.

The spelling of 72780396 in words is "seventy-two million, seven hundred eighty thousand, three hundred ninety-six".