28947150856 has 16 divisors (see below), whose sum is σ = 58450977900. Its totient is φ = 13360223424.

The previous prime is 28947150833. The next prime is 28947150887. The reversal of 28947150856 is 65805174982.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28073002500 + 874148356 = 167550^2 + 29566^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28947150797 and 28947150806.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139168891 + ... + 139169098.

Almost surely, 2^28947150856 is an apocalyptic number.

28947150856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28947150856 is an abundant number, since it is smaller than the sum of its proper divisors (29503827044).

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

28947150856 is a wasteful number, since it uses less digits than its factorization.

28947150856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278338008 (or 278338004 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 28947150856 in words is "twenty-eight billion, nine hundred forty-seven million, one hundred fifty thousand, eight hundred fifty-six".