28978702920 has 48 divisors (see below), whose sum is σ = 94180785660. Its totient is φ = 7727654016.

The previous prime is 28978702861. The next prime is 28978702927. The reversal of 28978702920 is 2920787982.

28978702920 is a `hidden beast` number, since 289 + 7 + 8 + 70 + 292 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27500915556 + 1477787364 = 165834^2 + 38442^2 .

It is not an unprimeable number, because it can be changed into a prime (28978702927) 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 11 ways as a sum of consecutive naturals, for example, 40247839 + ... + 40248558.

Almost surely, 2^28978702920 is an apocalyptic number.

28978702920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28978702920 is an abundant number, since it is smaller than the sum of its proper divisors (65202082740).

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

28978702920 is a wasteful number, since it uses less digits than its factorization.

28978702920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80496414 (or 80496407 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 28978702920 in words is "twenty-eight billion, nine hundred seventy-eight million, seven hundred two thousand, nine hundred twenty".