28587939978 has 32 divisors (see below), whose sum is σ = 61606633536. Its totient is φ = 8791630848.

The previous prime is 28587939943. The next prime is 28587939979. The reversal of 28587939978 is 87993978582.

It is not an unprimeable number, because it can be changed into a prime (28587939979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52650 + ... + 244842.

It is an arithmetic number, because the mean of its divisors is an integer number (1925207298).

Almost surely, 2^28587939978 is an apocalyptic number.

28587939978 is an abundant number, since it is smaller than the sum of its proper divisors (33018693558).

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

28587939978 is a wasteful number, since it uses less digits than its factorization.

28587939978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194118.

The product of its digits is 548674560, while the sum is 75.

The spelling of 28587939978 in words is "twenty-eight billion, five hundred eighty-seven million, nine hundred thirty-nine thousand, nine hundred seventy-eight".