128420988 has 24 divisors (see below), whose sum is σ = 301808640. Its totient is φ = 42498480.

The previous prime is 128420987. The next prime is 128420989. The reversal of 128420988 is 889024821.

It is an interprime number because it is at equal distance from previous prime (128420987) and next prime (128420989).

It is a super-2 number, since 2×128420988² = 32983900317792288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128420987) 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, 36828 + ... + 40163.

It is an arithmetic number, because the mean of its divisors is an integer number (12575360).

Almost surely, 2^128420988 is an apocalyptic number.

It is an amenable number.

128420988 is an abundant number, since it is smaller than the sum of its proper divisors (173387652).

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

128420988 is a wasteful number, since it uses less digits than its factorization.

128420988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77137 (or 77135 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 128420988 is about 11332.2984429462. The cubic root of 128420988 is about 504.5203274587.

The spelling of 128420988 in words is "one hundred twenty-eight million, four hundred twenty thousand, nine hundred eighty-eight".