84998781 has 48 divisors (see below), whose sum is σ = 150151680. Its totient is φ = 47355840.

The previous prime is 84998779. The next prime is 84998821. The reversal of 84998781 is 18789948.

It is not a de Polignac number, because 84998781 - 2¹ = 84998779 is a prime.

It is a super-2 number, since 2×84998781² = 14449585542971922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84998581) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53460 + ... + 55026.

It is an arithmetic number, because the mean of its divisors is an integer number (3128160).

Almost surely, 2^84998781 is an apocalyptic number.

It is an amenable number.

84998781 is a deficient number, since it is larger than the sum of its proper divisors (65152899).

84998781 is a wasteful number, since it uses less digits than its factorization.

84998781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631 (or 1618 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 84998781 is about 9219.4783474988. The cubic root of 84998781 is about 439.6808653488.

The spelling of 84998781 in words is "eighty-four million, nine hundred ninety-eight thousand, seven hundred eighty-one".