128899692 has 36 divisors (see below), whose sum is σ = 330699096. Its totient is φ = 42324480.

The previous prime is 128899691. The next prime is 128899697. The reversal of 128899692 is 296998821.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (128899691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24309 + ... + 29132.

It is an arithmetic number, because the mean of its divisors is an integer number (9186086).

Almost surely, 2^128899692 is an apocalyptic number.

128899692 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128899692 is an abundant number, since it is smaller than the sum of its proper divisors (201799404).

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

128899692 is a wasteful number, since it uses less digits than its factorization.

128899692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53518 (or 53513 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 128899692 is about 11353.4000193775. The cubic root of 128899692 is about 505.1464359834.

The spelling of 128899692 in words is "one hundred twenty-eight million, eight hundred ninety-nine thousand, six hundred ninety-two".