84891420 has 36 divisors (see below), whose sum is σ = 257504520. Its totient is φ = 22637664.

The previous prime is 84891407. The next prime is 84891427. The reversal of 84891420 is 2419848.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84891427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235630 + ... + 235989.

Almost surely, 2^84891420 is an apocalyptic number.

It is an amenable number.

84891420 is an abundant number, since it is smaller than the sum of its proper divisors (172613100).

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

84891420 is a wasteful number, since it uses less digits than its factorization.

84891420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471634 (or 471629 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 84891420 is about 9213.6539982789. The cubic root of 84891420 is about 439.4956687090.

The spelling of 84891420 in words is "eighty-four million, eight hundred ninety-one thousand, four hundred twenty".