84720870 has 64 divisors (see below), whose sum is σ = 243311040. Its totient is φ = 20853504.

The previous prime is 84720869. The next prime is 84720913. The reversal of 84720870 is 7802748.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8559 + ... + 15578.

It is an arithmetic number, because the mean of its divisors is an integer number (3801735).

Almost surely, 2^84720870 is an apocalyptic number.

84720870 is an abundant number, since it is smaller than the sum of its proper divisors (158590170).

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

84720870 is a wasteful number, since it uses less digits than its factorization.

84720870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24166 (or 24160 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 84720870 is about 9204.3940593610. The cubic root of 84720870 is about 439.2011503747.

The spelling of 84720870 in words is "eighty-four million, seven hundred twenty thousand, eight hundred seventy".