72821428044 has 24 divisors (see below), whose sum is σ = 175397849088. Its totient is φ = 23490783120.

The previous prime is 72821428019. The next prime is 72821428051. The reversal of 72821428044 is 44082412827.

It is a junction number, because it is equal to n+sod(n) for n = 72821427987 and 72821428005.

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, 97877892 + ... + 97878635.

It is an arithmetic number, because the mean of its divisors is an integer number (7308243712).

Almost surely, 2^72821428044 is an apocalyptic number.

It is an amenable number.

72821428044 is an abundant number, since it is smaller than the sum of its proper divisors (102576421044).

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

72821428044 is a wasteful number, since it uses less digits than its factorization.

72821428044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195756565 (or 195756563 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 42.

The spelling of 72821428044 in words is "seventy-two billion, eight hundred twenty-one million, four hundred twenty-eight thousand, forty-four".