72785820 has 24 divisors (see below), whose sum is σ = 203800464. Its totient is φ = 19409536.

The previous prime is 72785809. The next prime is 72785831. The reversal of 72785820 is 2858727.

It is an interprime number because it is at equal distance from previous prime (72785809) and next prime (72785831).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 606489 + ... + 606608.

It is an arithmetic number, because the mean of its divisors is an integer number (8491686).

Almost surely, 2^72785820 is an apocalyptic number.

It is an amenable number.

72785820 is an abundant number, since it is smaller than the sum of its proper divisors (131014644).

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

72785820 is a wasteful number, since it uses less digits than its factorization.

72785820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213109 (or 1213107 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 72785820 is about 8531.4606017962. The cubic root of 72785820 is about 417.5247836890.

The spelling of 72785820 in words is "seventy-two million, seven hundred eighty-five thousand, eight hundred twenty".