28537936778 has 16 divisors (see below), whose sum is σ = 46262652576. Its totient is φ = 13124810160.

The previous prime is 28537936753. The next prime is 28537936789. The reversal of 28537936778 is 87763973582.

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, 1931888 + ... + 1946603.

It is an arithmetic number, because the mean of its divisors is an integer number (2891415786).

Almost surely, 2^28537936778 is an apocalyptic number.

28537936778 is a deficient number, since it is larger than the sum of its proper divisors (17724715798).

28537936778 is a wasteful number, since it uses less digits than its factorization.

28537936778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878789.

The product of its digits is 106686720, while the sum is 65.

The spelling of 28537936778 in words is "twenty-eight billion, five hundred thirty-seven million, nine hundred thirty-six thousand, seven hundred seventy-eight".