84912780 has 96 divisors (see below), whose sum is σ = 254951424. Its totient is φ = 21060864.

The previous prime is 84912769. The next prime is 84912781. The reversal of 84912780 is 8721948.

It is not an unprimeable number, because it can be changed into a prime (84912781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50229 + ... + 51891.

It is an arithmetic number, because the mean of its divisors is an integer number (2655744).

Almost surely, 2^84912780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84912780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127475712).

84912780 is an abundant number, since it is smaller than the sum of its proper divisors (170038644).

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

84912780 is a wasteful number, since it uses less digits than its factorization.

84912780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735 (or 1733 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 84912780 is about 9214.8130746098. The cubic root of 84912780 is about 439.5325269303.

The spelling of 84912780 in words is "eighty-four million, nine hundred twelve thousand, seven hundred eighty".