28720634859 has 48 divisors (see below), whose sum is σ = 51755674880. Its totient is φ = 15547995360.

The previous prime is 28720634753. The next prime is 28720634893. The reversal of 28720634859 is 95843602782.

28720634859 is a `hidden beast` number, since 2 + 87 + 20 + 63 + 485 + 9 = 666.

It is not a de Polignac number, because 28720634859 - 2¹³ = 28720626667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28720630859) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 412012 + ... + 476649.

Almost surely, 2^28720634859 is an apocalyptic number.

28720634859 is a deficient number, since it is larger than the sum of its proper divisors (23035040021).

28720634859 is an equidigital number, since it uses as much as digits as its factorization.

28720634859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888702 (or 888690 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 28720634859 in words is "twenty-eight billion, seven hundred twenty million, six hundred thirty-four thousand, eight hundred fifty-nine".