84587681 has 4 divisors (see below), whose sum is σ = 84627732. Its totient is φ = 84547632.

The previous prime is 84587669. The next prime is 84587687. The reversal of 84587681 is 18678548.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23435281 + 61152400 = 4841^2 + 7820^2 .

It is a cyclic number.

It is not a de Polignac number, because 84587681 - 2¹⁴ = 84571297 is a prime.

It is a super-2 number, since 2×84587681² = 14310151553915522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84587687) 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 3 ways as a sum of consecutive naturals, for example, 16670 + ... + 21143.

It is an arithmetic number, because the mean of its divisors is an integer number (21156933).

Almost surely, 2^84587681 is an apocalyptic number.

It is an amenable number.

84587681 is a deficient number, since it is larger than the sum of its proper divisors (40051).

84587681 is a wasteful number, since it uses less digits than its factorization.

84587681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40050.

The product of its digits is 430080, while the sum is 47.

The square root of 84587681 is about 9197.1561365457. The cubic root of 84587681 is about 438.9708747928.

The spelling of 84587681 in words is "eighty-four million, five hundred eighty-seven thousand, six hundred eighty-one".