28880887878 has 16 divisors (see below), whose sum is σ = 64179750960. Its totient is φ = 9626962608.

The previous prime is 28880887829. The next prime is 28880887879. The reversal of 28880887878 is 87878808882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28880887879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267415575 + ... + 267415682.

It is an arithmetic number, because the mean of its divisors is an integer number (4011234435).

Almost surely, 2^28880887878 is an apocalyptic number.

28880887878 is an abundant number, since it is smaller than the sum of its proper divisors (35298863082).

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

28880887878 is a wasteful number, since it uses less digits than its factorization.

28880887878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534831268 (or 534831262 counting only the distinct ones).

The product of its (nonzero) digits is 205520896, while the sum is 72.

The spelling of 28880887878 in words is "twenty-eight billion, eight hundred eighty million, eight hundred eighty-seven thousand, eight hundred seventy-eight".