128996750 has 32 divisors (see below), whose sum is σ = 243172800. Its totient is φ = 51237600.

The previous prime is 128996743. The next prime is 128996771. The reversal of 128996750 is 57699821.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 128996695 and 128996704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35519 + ... + 38981.

It is an arithmetic number, because the mean of its divisors is an integer number (7599150).

Almost surely, 2^128996750 is an apocalyptic number.

128996750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128996750 is a deficient number, since it is larger than the sum of its proper divisors (114176050).

128996750 is a wasteful number, since it uses less digits than its factorization.

128996750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3629 (or 3619 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 128996750 is about 11357.6736174271. The cubic root of 128996750 is about 505.2731913993.

The spelling of 128996750 in words is "one hundred twenty-eight million, nine hundred ninety-six thousand, seven hundred fifty".