128033811 has 16 divisors (see below), whose sum is σ = 196221600. Its totient is φ = 82412064.

The previous prime is 128033809. The next prime is 128033819. The reversal of 128033811 is 118330821.

128033811 is a `hidden beast` number, since 1 + 280 + 3 + 381 + 1 = 666.

It is not a de Polignac number, because 128033811 - 2¹ = 128033809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (128033819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80976 + ... + 82541.

It is an arithmetic number, because the mean of its divisors is an integer number (12263850).

Almost surely, 2^128033811 is an apocalyptic number.

128033811 is a deficient number, since it is larger than the sum of its proper divisors (68187789).

128033811 is a wasteful number, since it uses less digits than its factorization.

128033811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163555 (or 163549 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 128033811 is about 11315.2026495331. The cubic root of 128033811 is about 504.0127902083.

The spelling of 128033811 in words is "one hundred twenty-eight million, thirty-three thousand, eight hundred eleven".