72861820 has 24 divisors (see below), whose sum is σ = 153435744. Its totient is φ = 29063616.

The previous prime is 72861809. The next prime is 72861839. The reversal of 72861820 is 2816827.

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, 2577 + ... + 12343.

It is an arithmetic number, because the mean of its divisors is an integer number (6393156).

Almost surely, 2^72861820 is an apocalyptic number.

It is an amenable number.

72861820 is an abundant number, since it is smaller than the sum of its proper divisors (80573924).

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

72861820 is a wasteful number, since it uses less digits than its factorization.

72861820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10149 (or 10147 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 72861820 is about 8535.9135422051. The cubic root of 72861820 is about 417.6700539517.

The spelling of 72861820 in words is "seventy-two million, eight hundred sixty-one thousand, eight hundred twenty".