28621207857 has 16 divisors (see below), whose sum is σ = 41633759232. Its totient is φ = 17344973520.

The previous prime is 28621207847. The next prime is 28621207913. The reversal of 28621207857 is 75870212682.

It is not a de Polignac number, because 28621207857 - 2⁶ = 28621207793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28621207847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 743088 + ... + 780654.

It is an arithmetic number, because the mean of its divisors is an integer number (2602109952).

Almost surely, 2^28621207857 is an apocalyptic number.

It is an amenable number.

28621207857 is a deficient number, since it is larger than the sum of its proper divisors (13012551375).

28621207857 is a wasteful number, since it uses less digits than its factorization.

28621207857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60668.

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 28621207857 in words is "twenty-eight billion, six hundred twenty-one million, two hundred seven thousand, eight hundred fifty-seven".