128968690 has 16 divisors (see below), whose sum is σ = 236079360. Its totient is φ = 50712880.

The previous prime is 128968687. The next prime is 128968727. The reversal of 128968690 is 96869821.

It is a happy number.

It is a super-2 number, since 2×128968690² = 33265846000632200, which contains 22 as substring.

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, 108706 + ... + 109885.

It is an arithmetic number, because the mean of its divisors is an integer number (14754960).

Almost surely, 2^128968690 is an apocalyptic number.

128968690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128968690 is a deficient number, since it is larger than the sum of its proper divisors (107110670).

128968690 is a wasteful number, since it uses less digits than its factorization.

128968690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218657.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 128968690 is about 11356.4382620609. The cubic root of 128968690 is about 505.2365522491.

The spelling of 128968690 in words is "one hundred twenty-eight million, nine hundred sixty-eight thousand, six hundred ninety".