128877690 has 16 divisors (see below), whose sum is σ = 309306528. Its totient is φ = 34367376.

The previous prime is 128877667. The next prime is 128877691. The reversal of 128877690 is 96778821.

It is a super-2 number, since 2×128877690² = 33218917959472200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128877691) 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, 2147932 + ... + 2147991.

It is an arithmetic number, because the mean of its divisors is an integer number (19331658).

Almost surely, 2^128877690 is an apocalyptic number.

128877690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128877690 is an abundant number, since it is smaller than the sum of its proper divisors (180428838).

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

128877690 is a wasteful number, since it uses less digits than its factorization.

128877690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295933.

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 128877690 is about 11352.4310171875. The cubic root of 128877690 is about 505.1176930538.

The spelling of 128877690 in words is "one hundred twenty-eight million, eight hundred seventy-seven thousand, six hundred ninety".