870909528123 has 20 divisors (see below), whose sum is σ = 1316662875528. Its totient is φ = 573611090400.

The previous prime is 870909528121. The next prime is 870909528127. The reversal of 870909528123 is 321825909078.

870909528123 is a `hidden beast` number, since 8 + 7 + 0 + 90 + 9 + 528 + 1 + 23 = 666.

It is not a de Polignac number, because 870909528123 - 2¹ = 870909528121 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 870909528123.

It is not an unprimeable number, because it can be changed into a prime (870909528121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64764178 + ... + 64777623.

Almost surely, 2^870909528123 is an apocalyptic number.

870909528123 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

870909528123 is a deficient number, since it is larger than the sum of its proper divisors (445753347405).

870909528123 is a wasteful number, since it uses less digits than its factorization.

870909528123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129541896 (or 129541887 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 870909528123 in words is "eight hundred seventy billion, nine hundred nine million, five hundred twenty-eight thousand, one hundred twenty-three".