128888826 has 64 divisors (see below), whose sum is σ = 295612416. Its totient is φ = 37083200.

The previous prime is 128888813. The next prime is 128888839. The reversal of 128888826 is 628888821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128888813) and next prime (128888839).

It is a super-2 number, since 2×128888826² = 33224658935316552, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298831 + ... + 299261.

It is an arithmetic number, because the mean of its divisors is an integer number (4618944).

Almost surely, 2^128888826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128888826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147806208).

128888826 is an abundant number, since it is smaller than the sum of its proper divisors (166723590).

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

128888826 is a wasteful number, since it uses less digits than its factorization.

128888826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its digits is 786432, while the sum is 51.

The square root of 128888826 is about 11352.9214742286. The cubic root of 128888826 is about 505.1322412884.

The spelling of 128888826 in words is "one hundred twenty-eight million, eight hundred eighty-eight thousand, eight hundred twenty-six".