84000000 has 252 divisors, whose sum is σ = 319370912. Its totient is φ = 19200000.

The previous prime is 83999999. The next prime is 84000013. The reversal of 84000000 is 48.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 84000000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 11999997 + ... + 12000003.

Almost surely, 2^84000000 is an apocalyptic number.

84000000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159685456).

84000000 is an abundant number, since it is smaller than the sum of its proper divisors (235370912).

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

84000000 is an frugal number, since it uses more digits than its factorization.

84000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 84000000 is about 9165.1513899117. The cubic root of 84000000 is about 437.9519139888.

Adding to 84000000 its reverse (48), we get a palindrome (84000048).

The spelling of 84000000 in words is "eighty-four million", and thus it is an aban number.