128913650 has 12 divisors (see below), whose sum is σ = 239779482. Its totient is φ = 51565440.

The previous prime is 128913647. The next prime is 128913709. The reversal of 128913650 is 56319821.

It can be written as a sum of positive squares in 3 ways, for example, as 109474369 + 19439281 = 10463^2 + 4409^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128913650.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1289087 + ... + 1289186.

Almost surely, 2^128913650 is an apocalyptic number.

128913650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128913650 is a deficient number, since it is larger than the sum of its proper divisors (110865832).

128913650 is a wasteful number, since it uses less digits than its factorization.

128913650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578285 (or 2578280 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 128913650 is about 11354.0147084633. The cubic root of 128913650 is about 505.1646687124.

The spelling of 128913650 in words is "one hundred twenty-eight million, nine hundred thirteen thousand, six hundred fifty".