128506365 has 64 divisors (see below), whose sum is σ = 252806400. Its totient is φ = 61523712.

The previous prime is 128506363. The next prime is 128506369. The reversal of 128506365 is 563605821.

128506365 is a `hidden beast` number, since 12 + 8 + 5 + 0 + 636 + 5 = 666.

It is not a de Polignac number, because 128506365 - 2¹ = 128506363 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128506361) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63946 + ... + 65924.

It is an arithmetic number, because the mean of its divisors is an integer number (3950100).

Almost surely, 2^128506365 is an apocalyptic number.

128506365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128506365 is a deficient number, since it is larger than the sum of its proper divisors (124300035).

128506365 is a wasteful number, since it uses less digits than its factorization.

128506365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043 (or 2037 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 128506365 is about 11336.0647933928. The cubic root of 128506365 is about 504.6321079669.

The spelling of 128506365 in words is "one hundred twenty-eight million, five hundred six thousand, three hundred sixty-five".