85721872434 has 32 divisors (see below), whose sum is σ = 189131008320. Its totient is φ = 25684454400.

The previous prime is 85721872429. The next prime is 85721872493. The reversal of 85721872434 is 43427812758.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7290847 + ... + 7302594.

It is an arithmetic number, because the mean of its divisors is an integer number (5910344010).

Almost surely, 2^85721872434 is an apocalyptic number.

85721872434 is an abundant number, since it is smaller than the sum of its proper divisors (103409135886).

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

85721872434 is a wasteful number, since it uses less digits than its factorization.

85721872434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14593546.

The product of its digits is 3010560, while the sum is 51.

The spelling of 85721872434 in words is "eighty-five billion, seven hundred twenty-one million, eight hundred seventy-two thousand, four hundred thirty-four".