84747420 has 36 divisors (see below), whose sum is σ = 257067720. Its totient is φ = 22599264.

The previous prime is 84747419. The next prime is 84747461. The reversal of 84747420 is 2474748.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235230 + ... + 235589.

It is an arithmetic number, because the mean of its divisors is an integer number (7140770).

Almost surely, 2^84747420 is an apocalyptic number.

It is an amenable number.

84747420 is an abundant number, since it is smaller than the sum of its proper divisors (172320300).

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

84747420 is a wasteful number, since it uses less digits than its factorization.

84747420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470834 (or 470829 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 84747420 is about 9205.8361923293. The cubic root of 84747420 is about 439.2470248354.

The spelling of 84747420 in words is "eighty-four million, seven hundred forty-seven thousand, four hundred twenty".