72994428 has 72 divisors (see below), whose sum is σ = 209190800. Its totient is φ = 21275136.

The previous prime is 72994403. The next prime is 72994459. The reversal of 72994428 is 82449927.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4788 + ... + 12996.

Almost surely, 2^72994428 is an apocalyptic number.

72994428 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72994428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104595400).

72994428 is an abundant number, since it is smaller than the sum of its proper divisors (136196372).

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

72994428 is a wasteful number, since it uses less digits than its factorization.

72994428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8251 (or 8246 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 72994428 is about 8543.6776624589. The cubic root of 72994428 is about 417.9232859073.

The spelling of 72994428 in words is "seventy-two million, nine hundred ninety-four thousand, four hundred twenty-eight".