128999742 has 48 divisors (see below), whose sum is σ = 274678272. Its totient is φ = 40325040.

The previous prime is 128999719. The next prime is 128999771. The reversal of 128999742 is 247999821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1015683 + ... + 1015809.

It is an arithmetic number, because the mean of its divisors is an integer number (5722464).

Almost surely, 2^128999742 is an apocalyptic number.

128999742 is an abundant number, since it is smaller than the sum of its proper divisors (145678530).

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

128999742 is a wasteful number, since it uses less digits than its factorization.

128999742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 206 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 128999742 is about 11357.8053337782. The cubic root of 128999742 is about 505.2770978690.

The spelling of 128999742 in words is "one hundred twenty-eight million, nine hundred ninety-nine thousand, seven hundred forty-two".