128898157 has 4 divisors (see below), whose sum is σ = 130713696. Its totient is φ = 127082620.

The previous prime is 128898139. The next prime is 128898167. The reversal of 128898157 is 751898821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128898157 is a prime.

It is a super-2 number, since 2×128898157² = 33229469755993298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128898157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128898167) 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 3 ways as a sum of consecutive naturals, for example, 907663 + ... + 907804.

It is an arithmetic number, because the mean of its divisors is an integer number (32678424).

Almost surely, 2^128898157 is an apocalyptic number.

It is an amenable number.

128898157 is a deficient number, since it is larger than the sum of its proper divisors (1815539).

128898157 is an equidigital number, since it uses as much as digits as its factorization.

128898157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815538.

The product of its digits is 322560, while the sum is 49.

The square root of 128898157 is about 11353.3324182814. The cubic root of 128898157 is about 505.1444307992.

The spelling of 128898157 in words is "one hundred twenty-eight million, eight hundred ninety-eight thousand, one hundred fifty-seven".