128820534 has 16 divisors (see below), whose sum is σ = 257853888. Its totient is φ = 42904712.

The previous prime is 128820529. The next prime is 128820547. The reversal of 128820534 is 435028821.

It is a junction number, because it is equal to n+sod(n) for n = 128820495 and 128820504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372 + ... + 16055.

It is an arithmetic number, because the mean of its divisors is an integer number (16115868).

Almost surely, 2^128820534 is an apocalyptic number.

128820534 is an abundant number, since it is smaller than the sum of its proper divisors (129033354).

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

128820534 is a wasteful number, since it uses less digits than its factorization.

128820534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17739.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 128820534 is about 11349.9133917400. The cubic root of 128820534 is about 505.0430104203.

The spelling of 128820534 in words is "one hundred twenty-eight million, eight hundred twenty thousand, five hundred thirty-four".