87825581 has 4 divisors (see below), whose sum is σ = 92448000. Its totient is φ = 83203164.

The previous prime is 87825557. The next prime is 87825593. The reversal of 87825581 is 18552878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18552878 = 2 ⋅9276439.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87825581 is a prime.

It is a super-2 number, since 2×87825581² = 15426665355975122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87825181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2311181 + ... + 2311218.

It is an arithmetic number, because the mean of its divisors is an integer number (23112000).

Almost surely, 2^87825581 is an apocalyptic number.

It is an amenable number.

87825581 is a deficient number, since it is larger than the sum of its proper divisors (4622419).

87825581 is a wasteful number, since it uses less digits than its factorization.

87825581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4622418.

The product of its digits is 179200, while the sum is 44.

The square root of 87825581 is about 9371.5303446129. The cubic root of 87825581 is about 444.5019567912.

The spelling of 87825581 in words is "eighty-seven million, eight hundred twenty-five thousand, five hundred eighty-one".