81587083 has 12 divisors (see below), whose sum is σ = 86627208. Its totient is φ = 76826880.

The previous prime is 81587081. The next prime is 81587111. The reversal of 81587083 is 38078518.

It is not a de Polignac number, because 81587083 - 2¹ = 81587081 is a prime.

It is a super-2 number, since 2×81587083² = 13312904224897778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81587081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69088 + ... + 70258.

It is an arithmetic number, because the mean of its divisors is an integer number (7218934).

Almost surely, 2^81587083 is an apocalyptic number.

81587083 is a deficient number, since it is larger than the sum of its proper divisors (5040125).

81587083 is a wasteful number, since it uses less digits than its factorization.

81587083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402 (or 1383 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 81587083 is about 9032.5568362452. The cubic root of 81587083 is about 433.7176892940.

The spelling of 81587083 in words is "eighty-one million, five hundred eighty-seven thousand, eighty-three".