28577777620 has 24 divisors (see below), whose sum is σ = 68586666624. Its totient is φ = 9798095136.

The previous prime is 28577777611. The next prime is 28577777651. The reversal of 28577777620 is 2677777582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102063352 + ... + 102063631.

It is an arithmetic number, because the mean of its divisors is an integer number (2857777776).

Almost surely, 2^28577777620 is an apocalyptic number.

28577777620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28577777620 is an abundant number, since it is smaller than the sum of its proper divisors (40008889004).

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

28577777620 is a wasteful number, since it uses less digits than its factorization.

28577777620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204126999 (or 204126997 counting only the distinct ones).

The product of its (nonzero) digits is 16134720, while the sum is 58.

The spelling of 28577777620 in words is "twenty-eight billion, five hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred twenty".