84488781 has 16 divisors (see below), whose sum is σ = 121504320. Its totient is φ = 51912960.

The previous prime is 84488777. The next prime is 84488791. The reversal of 84488781 is 18788448.

It is a happy number.

It is not a de Polignac number, because 84488781 - 2² = 84488777 is a prime.

It is a super-2 number, since 2×84488781² = 14276708229731922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84488781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84488711) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 33130 + ... + 35588.

It is an arithmetic number, because the mean of its divisors is an integer number (7594020).

Almost surely, 2^84488781 is an apocalyptic number.

It is an amenable number.

84488781 is a deficient number, since it is larger than the sum of its proper divisors (37015539).

84488781 is a wasteful number, since it uses less digits than its factorization.

84488781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356.

The product of its digits is 458752, while the sum is 48.

The square root of 84488781 is about 9191.7779020166. Note that the first 3 decimals coincide. The cubic root of 84488781 is about 438.7997263467.

The spelling of 84488781 in words is "eighty-four million, four hundred eighty-eight thousand, seven hundred eighty-one".