28388988436 has 24 divisors (see below), whose sum is σ = 50320448640. Its totient is φ = 14011795200.

The previous prime is 28388988401. The next prime is 28388988487. The reversal of 28388988436 is 63488988382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2424516 + ... + 2436196.

It is an arithmetic number, because the mean of its divisors is an integer number (2096685360).

Almost surely, 2^28388988436 is an apocalyptic number.

It is an amenable number.

28388988436 is a deficient number, since it is larger than the sum of its proper divisors (21931460204).

28388988436 is a wasteful number, since it uses less digits than its factorization.

28388988436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19455 (or 19453 counting only the distinct ones).

The product of its digits is 127401984, while the sum is 67.

The spelling of 28388988436 in words is "twenty-eight billion, three hundred eighty-eight million, nine hundred eighty-eight thousand, four hundred thirty-six".