81896583 has 32 divisors (see below), whose sum is σ = 117642240. Its totient is φ = 50561280.

The previous prime is 81896569. The next prime is 81896597. The reversal of 81896583 is 38569818.

It is an interprime number because it is at equal distance from previous prime (81896569) and next prime (81896597).

It is not a de Polignac number, because 81896583 - 2⁴ = 81896567 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81896383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 357513 + ... + 357741.

It is an arithmetic number, because the mean of its divisors is an integer number (3676320).

Almost surely, 2^81896583 is an apocalyptic number.

81896583 is a deficient number, since it is larger than the sum of its proper divisors (35745657).

81896583 is a wasteful number, since it uses less digits than its factorization.

81896583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399.

The product of its digits is 414720, while the sum is 48.

The square root of 81896583 is about 9049.6730880182. The cubic root of 81896583 is about 434.2654322132.

The spelling of 81896583 in words is "eighty-one million, eight hundred ninety-six thousand, five hundred eighty-three".