28321665104 has 20 divisors (see below), whose sum is σ = 54875857140. Its totient is φ = 14160153600.

The previous prime is 28321665077. The next prime is 28321665137. The reversal of 28321665104 is 40156612382.

It can be written as a sum of positive squares in 2 ways, for example, as 9070657600 + 19251007504 = 95240^2 + 138748^2 .

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, 566432 + ... + 614400.

It is an arithmetic number, because the mean of its divisors is an integer number (2743792857).

Almost surely, 2^28321665104 is an apocalyptic number.

It is an amenable number.

28321665104 is a deficient number, since it is larger than the sum of its proper divisors (26554192036).

28321665104 is a wasteful number, since it uses less digits than its factorization.

28321665104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84878 (or 84872 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 28321665104 in words is "twenty-eight billion, three hundred twenty-one million, six hundred sixty-five thousand, one hundred four".