28877020820 has 48 divisors (see below), whose sum is σ = 60900336000. Its totient is φ = 11501650560.

The previous prime is 28877020807. The next prime is 28877020849. The reversal of 28877020820 is 2802077882.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5853755 + ... + 5858685.

It is an arithmetic number, because the mean of its divisors is an integer number (1268757000).

Almost surely, 2^28877020820 is an apocalyptic number.

28877020820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28877020820 is an abundant number, since it is smaller than the sum of its proper divisors (32023315180).

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

28877020820 is a wasteful number, since it uses less digits than its factorization.

28877020820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6128 (or 6126 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 44.

The spelling of 28877020820 in words is "twenty-eight billion, eight hundred seventy-seven million, twenty thousand, eight hundred twenty".