128764530 has 24 divisors (see below), whose sum is σ = 334788012. Its totient is φ = 34337184.

The previous prime is 128764529. The next prime is 128764541. The reversal of 128764530 is 35467821.

128764530 is a `hidden beast` number, since 1 + 2 + 8 + 7 + 645 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 126630009 + 2134521 = 11253^2 + 1461^2 .

It is a super-2 number, since 2×128764530² = 33160608372241800, which contains 22 as substring.

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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 715269 + ... + 715448.

Almost surely, 2^128764530 is an apocalyptic number.

128764530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128764530 is an abundant number, since it is smaller than the sum of its proper divisors (206023482).

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

128764530 is a wasteful number, since it uses less digits than its factorization.

128764530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430730 (or 1430727 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 128764530 is about 11347.4459681463. The cubic root of 128764530 is about 504.9698116124.

The spelling of 128764530 in words is "one hundred twenty-eight million, seven hundred sixty-four thousand, five hundred thirty".