84871420929 has 45 divisors (see below), whose sum is σ = 129885508883. Its totient is φ = 53403735024.

The previous prime is 84871420883. The next prime is 84871420939. The reversal of 84871420929 is 92902417848.

The square root of 84871420929 is 291327.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5584124529 + 79287296400 = 74727^2 + 281580^2 .

It is not a de Polignac number, because 84871420929 - 2⁷ = 84871420801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84871420939) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 315507007 + ... + 315507275.

Almost surely, 2^84871420929 is an apocalyptic number.

84871420929 is the 291327-th square number.

84871420929 is the 145664-th centered octagonal number.

It is an amenable number.

84871420929 is a deficient number, since it is larger than the sum of its proper divisors (45014087954).

84871420929 is an frugal number, since it uses more digits than its factorization.

84871420929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 84871420929 in words is "eighty-four billion, eight hundred seventy-one million, four hundred twenty thousand, nine hundred twenty-nine".