90293881 has 4 divisors (see below), whose sum is σ = 90327412. Its totient is φ = 90260352.

The previous prime is 90293873. The next prime is 90293887. The reversal of 90293881 is 18839209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18839209 = 79 ⋅238471.

It can be written as a sum of positive squares in 2 ways, for example, as 53582400 + 36711481 = 7320^2 + 6059^2 .

It is a cyclic number.

It is not a de Polignac number, because 90293881 - 2³ = 90293873 is a prime.

It is a super-2 number, since 2×90293881² = 16305969892084322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90293887) 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, 12336 + ... + 18241.

It is an arithmetic number, because the mean of its divisors is an integer number (22581853).

Almost surely, 2^90293881 is an apocalyptic number.

It is an amenable number.

90293881 is a deficient number, since it is larger than the sum of its proper divisors (33531).

90293881 is a wasteful number, since it uses less digits than its factorization.

90293881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33530.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 90293881 is about 9502.3092456518. The cubic root of 90293881 is about 448.6277223658.

The spelling of 90293881 in words is "ninety million, two hundred ninety-three thousand, eight hundred eighty-one".