128667090 has 32 divisors (see below), whose sum is σ = 309920256. Its totient is φ = 34186880.

The previous prime is 128667079. The next prime is 128667139. The reversal of 128667090 is 90766821.

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, 799 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (9685008).

Almost surely, 2^128667090 is an apocalyptic number.

128667090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128667090 is an abundant number, since it is smaller than the sum of its proper divisors (181253166).

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

128667090 is a wasteful number, since it uses less digits than its factorization.

128667090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15554.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 128667090 is about 11343.1516784358. The cubic root of 128667090 is about 504.8424041783.

The spelling of 128667090 in words is "one hundred twenty-eight million, six hundred sixty-seven thousand, ninety".