84775489920 has 512 divisors, whose sum is σ = 328523558400. Its totient is φ = 20490117120.

The previous prime is 84775489919. The next prime is 84775489937. The reversal of 84775489920 is 2998457748.

84775489920 is a `hidden beast` number, since 8 + 477 + 54 + 8 + 99 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 124121899 + ... + 124122581.

It is an arithmetic number, because the mean of its divisors is an integer number (641647575).

Almost surely, 2^84775489920 is an apocalyptic number.

84775489920 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 84775489920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164261779200).

84775489920 is an abundant number, since it is smaller than the sum of its proper divisors (243748068480).

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

84775489920 is a wasteful number, since it uses less digits than its factorization.

84775489920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375 (or 1357 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 84775489920 in words is "eighty-four billion, seven hundred seventy-five million, four hundred eighty-nine thousand, nine hundred twenty".