128877791502 has 64 divisors (see below), whose sum is σ = 275399792640. Its totient is φ = 40087605600.

The previous prime is 128877791491. The next prime is 128877791531. The reversal of 128877791502 is 205197778821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9406477 + ... + 9420167.

It is an arithmetic number, because the mean of its divisors is an integer number (4303121760).

Almost surely, 2^128877791502 is an apocalyptic number.

128877791502 is an abundant number, since it is smaller than the sum of its proper divisors (146522001138).

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

128877791502 is a wasteful number, since it uses less digits than its factorization.

128877791502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14949.

The product of its (nonzero) digits is 3951360, while the sum is 57.

The spelling of 128877791502 in words is "one hundred twenty-eight billion, eight hundred seventy-seven million, seven hundred ninety-one thousand, five hundred two".