28290856978 has 16 divisors (see below), whose sum is σ = 43029127800. Its totient is φ = 13947918336.

The previous prime is 28290856973. The next prime is 28290857011. The reversal of 28290856978 is 87965809282.

It can be written as a sum of positive squares in 4 ways, for example, as 22493100529 + 5797756449 = 149977^2 + 76143^2 .

It is not an unprimeable number, because it can be changed into a prime (28290856973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 567226 + ... + 615082.

Almost surely, 2^28290856978 is an apocalyptic number.

28290856978 is a deficient number, since it is larger than the sum of its proper divisors (14738270822).

28290856978 is a wasteful number, since it uses less digits than its factorization.

28290856978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51981.

The product of its (nonzero) digits is 34836480, while the sum is 64.

The spelling of 28290856978 in words is "twenty-eight billion, two hundred ninety million, eight hundred fifty-six thousand, nine hundred seventy-eight".