128888540 has 24 divisors (see below), whose sum is σ = 295272432. Its totient is φ = 46868480.

The previous prime is 128888491. The next prime is 128888561. The reversal of 128888540 is 45888821.

It is a happy number.

It is a super-2 number, since 2×128888540² = 33224511486663200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 128888491 and 128888500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292709 + ... + 293148.

It is an arithmetic number, because the mean of its divisors is an integer number (12303018).

Almost surely, 2^128888540 is an apocalyptic number.

128888540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128888540 is an abundant number, since it is smaller than the sum of its proper divisors (166383892).

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

128888540 is a wasteful number, since it uses less digits than its factorization.

128888540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585877 (or 585875 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 44.

The square root of 128888540 is about 11352.9088783448. The cubic root of 128888540 is about 505.1318676643.

The spelling of 128888540 in words is "one hundred twenty-eight million, eight hundred eighty-eight thousand, five hundred forty".