84645081 has 20 divisors (see below), whose sum is σ = 128837412. Its totient is φ = 55362528.

The previous prime is 84645079. The next prime is 84645089. The reversal of 84645081 is 18054648.

84645081 is a `hidden beast` number, since 8 + 4 + 645 + 0 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 29648025 + 54997056 = 5445^2 + 7416^2 .

It is not a de Polignac number, because 84645081 - 2¹ = 84645079 is a prime.

It is a super-2 number, since 2×84645081² = 14329579474993122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (84645089) 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 19 ways as a sum of consecutive naturals, for example, 5566 + ... + 14151.

Almost surely, 2^84645081 is an apocalyptic number.

84645081 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

84645081 is a deficient number, since it is larger than the sum of its proper divisors (44192331).

84645081 is a wasteful number, since it uses less digits than its factorization.

84645081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19782 (or 19773 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 84645081 is about 9200.2761371602. The cubic root of 84645081 is about 439.0701454771.

The spelling of 84645081 in words is "eighty-four million, six hundred forty-five thousand, eighty-one".