72821208420 has 72 divisors (see below), whose sum is σ = 232516851840. Its totient is φ = 18396936000.

The previous prime is 72821208419. The next prime is 72821208457. The reversal of 72821208420 is 2480212827.

72821208420 is a `hidden beast` number, since 7 + 2 + 8 + 21 + 208 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 10642956 + ... + 10649795.

It is an arithmetic number, because the mean of its divisors is an integer number (3229400720).

Almost surely, 2^72821208420 is an apocalyptic number.

It is an amenable number.

72821208420 is an abundant number, since it is smaller than the sum of its proper divisors (159695643420).

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

72821208420 is a wasteful number, since it uses less digits than its factorization.

72821208420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21292785 (or 21292780 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The spelling of 72821208420 in words is "seventy-two billion, eight hundred twenty-one million, two hundred eight thousand, four hundred twenty".