128691422 has 8 divisors (see below), whose sum is σ = 193215456. Its totient is φ = 64286272.

The previous prime is 128691401. The next prime is 128691443. The reversal of 128691422 is 224196821.

It is an interprime number because it is at equal distance from previous prime (128691401) and next prime (128691443).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×128691422² = 33122964192764168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26963 + ... + 31374.

It is an arithmetic number, because the mean of its divisors is an integer number (24151932).

Almost surely, 2^128691422 is an apocalyptic number.

128691422 is a deficient number, since it is larger than the sum of its proper divisors (64524034).

128691422 is a wasteful number, since it uses less digits than its factorization.

128691422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59442.

The product of its digits is 13824, while the sum is 35.

The square root of 128691422 is about 11344.2241691532. The cubic root of 128691422 is about 504.8742254496.

The spelling of 128691422 in words is "one hundred twenty-eight million, six hundred ninety-one thousand, four hundred twenty-two".