84557681 has 8 divisors (see below), whose sum is σ = 91337064. Its totient is φ = 77817600.

The previous prime is 84557659. The next prime is 84557689. The reversal of 84557681 is 18675548.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1018081 + 83539600 = 1009^2 + 9140^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84557681 is a prime.

It is a super-2 number, since 2×84557681² = 14300002832195522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84557689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5270 + ... + 14031.

It is an arithmetic number, because the mean of its divisors is an integer number (11417133).

Almost surely, 2^84557681 is an apocalyptic number.

It is an amenable number.

84557681 is a deficient number, since it is larger than the sum of its proper divisors (6779383).

84557681 is a wasteful number, since it uses less digits than its factorization.

84557681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19651.

The product of its digits is 268800, while the sum is 44.

The square root of 84557681 is about 9195.5250529809. The cubic root of 84557681 is about 438.9189732895.

The spelling of 84557681 in words is "eighty-four million, five hundred fifty-seven thousand, six hundred eighty-one".