84131864 has 8 divisors (see below), whose sum is σ = 157747260. Its totient is φ = 42065928.

The previous prime is 84131863. The next prime is 84131881. The reversal of 84131864 is 46813148.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×84131864² = 14156341080228992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84131863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5258234 + ... + 5258249.

Almost surely, 2^84131864 is an apocalyptic number.

It is an amenable number.

84131864 is a deficient number, since it is larger than the sum of its proper divisors (73615396).

84131864 is a wasteful number, since it uses less digits than its factorization.

84131864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10516489 (or 10516485 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 84131864 is about 9172.3423398824. The cubic root of 84131864 is about 438.1809612056.

The spelling of 84131864 in words is "eighty-four million, one hundred thirty-one thousand, eight hundred sixty-four".