128891414 has 16 divisors (see below), whose sum is σ = 196954656. Its totient is φ = 63244800.

The previous prime is 128891393. The next prime is 128891417. The reversal of 128891414 is 414198821.

It is a super-2 number, since 2×128891414² = 33225993205838792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128891417) 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, 69479 + ... + 71309.

It is an arithmetic number, because the mean of its divisors is an integer number (12309666).

Almost surely, 2^128891414 is an apocalyptic number.

128891414 is a deficient number, since it is larger than the sum of its proper divisors (68063242).

128891414 is a wasteful number, since it uses less digits than its factorization.

128891414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471.

The product of its digits is 18432, while the sum is 38.

The square root of 128891414 is about 11353.0354531288. The cubic root of 128891414 is about 505.1356221698.

The spelling of 128891414 in words is "one hundred twenty-eight million, eight hundred ninety-one thousand, four hundred fourteen".