128764825 has 24 divisors (see below), whose sum is σ = 185934528. Its totient is φ = 86623680.

The previous prime is 128764807. The next prime is 128764829. The reversal of 128764825 is 528467821.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-128764825 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128764829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2334 + ... + 16216.

It is an arithmetic number, because the mean of its divisors is an integer number (7747272).

Almost surely, 2^128764825 is an apocalyptic number.

It is an amenable number.

128764825 is a deficient number, since it is larger than the sum of its proper divisors (57169703).

128764825 is a wasteful number, since it uses less digits than its factorization.

128764825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13953 (or 13948 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 128764825 is about 11347.4589666586. The cubic root of 128764825 is about 504.9701972413.

The spelling of 128764825 in words is "one hundred twenty-eight million, seven hundred sixty-four thousand, eight hundred twenty-five".