128156955 has 16 divisors (see below), whose sum is σ = 205601280. Its totient is φ = 68167008.

The previous prime is 128156933. The next prime is 128156983. The reversal of 128156955 is 559651821.

It is a happy number.

It is not a de Polignac number, because 128156955 - 2⁵ = 128156923 is a prime.

It is a super-2 number, since 2×128156955² = 32848410229744050, which contains 22 as substring.

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, 5587 + ... + 16956.

It is an arithmetic number, because the mean of its divisors is an integer number (12850080).

Almost surely, 2^128156955 is an apocalyptic number.

128156955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128156955 is a deficient number, since it is larger than the sum of its proper divisors (77444325).

128156955 is a wasteful number, since it uses less digits than its factorization.

128156955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22930.

The product of its digits is 108000, while the sum is 42.

The square root of 128156955 is about 11320.6428704381. The cubic root of 128156955 is about 504.1743263489.

The spelling of 128156955 in words is "one hundred twenty-eight million, one hundred fifty-six thousand, nine hundred fifty-five".