90587081 has 8 divisors (see below), whose sum is σ = 99935304. Its totient is φ = 81578880.

The previous prime is 90587071. The next prime is 90587129. The reversal of 90587081 is 18078509.

It can be written as a sum of positive squares in 4 ways, for example, as 18490000 + 72097081 = 4300^2 + 8491^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 90587081 - 2¹⁰ = 90586057 is a prime.

It is a super-2 number, since 2×90587081² = 16412038488201122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90587051) 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, 84446 + ... + 85511.

It is an arithmetic number, because the mean of its divisors is an integer number (12491913).

Almost surely, 2^90587081 is an apocalyptic number.

It is an amenable number.

90587081 is a deficient number, since it is larger than the sum of its proper divisors (9348223).

90587081 is a wasteful number, since it uses less digits than its factorization.

90587081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170011.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 90587081 is about 9517.7245705053. The cubic root of 90587081 is about 449.1127885659.

The spelling of 90587081 in words is "ninety million, five hundred eighty-seven thousand, eighty-one".