72497820 has 24 divisors (see below), whose sum is σ = 202994064. Its totient is φ = 19332736.

The previous prime is 72497807. The next prime is 72497827. The reversal of 72497820 is 2879427.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72497827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604089 + ... + 604208.

It is an arithmetic number, because the mean of its divisors is an integer number (8458086).

Almost surely, 2^72497820 is an apocalyptic number.

It is an amenable number.

72497820 is an abundant number, since it is smaller than the sum of its proper divisors (130496244).

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

72497820 is a wasteful number, since it uses less digits than its factorization.

72497820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208309 (or 1208307 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 72497820 is about 8514.5651679930. The cubic root of 72497820 is about 416.9733663671.

The spelling of 72497820 in words is "seventy-two million, four hundred ninety-seven thousand, eight hundred twenty".