28891272990 has 32 divisors (see below), whose sum is σ = 69483847680. Its totient is φ = 7688251424.

The previous prime is 28891272983. The next prime is 28891273007. The reversal of 28891272990 is 9927219882.

It is a self number, because there is not a number n which added to its sum of digits gives 28891272990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990894 + ... + 1019633.

It is an arithmetic number, because the mean of its divisors is an integer number (2171370240).

Almost surely, 2^28891272990 is an apocalyptic number.

28891272990 is an abundant number, since it is smaller than the sum of its proper divisors (40592574690).

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

28891272990 is a wasteful number, since it uses less digits than its factorization.

28891272990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011016.

The product of its (nonzero) digits is 2612736, while the sum is 57.

The spelling of 28891272990 in words is "twenty-eight billion, eight hundred ninety-one million, two hundred seventy-two thousand, nine hundred ninety".