128537811 has 12 divisors (see below), whose sum is σ = 191655360. Its totient is φ = 82927440.

The previous prime is 128537803. The next prime is 128537821. The reversal of 128537811 is 118735821.

128537811 is a `hidden beast` number, since 1 + 285 + 378 + 1 + 1 = 666.

It is not a de Polignac number, because 128537811 - 2³ = 128537803 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (128537821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230076 + ... + 230633.

It is an arithmetic number, because the mean of its divisors is an integer number (15971280).

Almost surely, 2^128537811 is an apocalyptic number.

128537811 is a deficient number, since it is larger than the sum of its proper divisors (63117549).

128537811 is a wasteful number, since it uses less digits than its factorization.

128537811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460746 (or 460743 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 128537811 is about 11337.4516978023. The cubic root of 128537811 is about 504.6732664135.

The spelling of 128537811 in words is "one hundred twenty-eight million, five hundred thirty-seven thousand, eight hundred eleven".