28720620572 has 24 divisors (see below), whose sum is σ = 57498002016. Its totient is φ = 12296674368.

The previous prime is 28720620569. The next prime is 28720620601. The reversal of 28720620572 is 27502602782.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477923 + ... + 534650.

It is an arithmetic number, because the mean of its divisors is an integer number (2395750084).

Almost surely, 2^28720620572 is an apocalyptic number.

It is an amenable number.

28720620572 is an abundant number, since it is smaller than the sum of its proper divisors (28777381444).

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

28720620572 is a wasteful number, since it uses less digits than its factorization.

28720620572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013597 (or 1013595 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 28720620572 in words is "twenty-eight billion, seven hundred twenty million, six hundred twenty thousand, five hundred seventy-two".