28720618324 has 12 divisors (see below), whose sum is σ = 50266049344. Its totient is φ = 14358889944.

The previous prime is 28720618313. The next prime is 28720618343. The reversal of 28720618324 is 42381602782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308604 + ... + 390739.

Almost surely, 2^28720618324 is an apocalyptic number.

It is an amenable number.

28720618324 is a deficient number, since it is larger than the sum of its proper divisors (21545431020).

28720618324 is a wasteful number, since it uses less digits than its factorization.

28720618324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709614 (or 709612 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 28720618324 in words is "twenty-eight billion, seven hundred twenty million, six hundred eighteen thousand, three hundred twenty-four".