128412634 has 36 divisors (see below), whose sum is σ = 234327114. Its totient is φ = 52619952.

The previous prime is 128412629. The next prime is 128412637. The reversal of 128412634 is 436214821.

It can be written as a sum of positive squares in only one way, i.e., 109516225 + 18896409 = 10465^2 + 4347^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128412596 and 128412605.

It is not an unprimeable number, because it can be changed into a prime (128412637) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 50604 + ... + 53080.

Almost surely, 2^128412634 is an apocalyptic number.

128412634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

128412634 is a deficient number, since it is larger than the sum of its proper divisors (105914480).

128412634 is a wasteful number, since it uses less digits than its factorization.

128412634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539 (or 2509 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 128412634 is about 11331.9298444704. The cubic root of 128412634 is about 504.5093872578.

The spelling of 128412634 in words is "one hundred twenty-eight million, four hundred twelve thousand, six hundred thirty-four".