90423081 has 48 divisors (see below), whose sum is σ = 159727680. Its totient is φ = 50379840.

The previous prime is 90423077. The next prime is 90423083. The reversal of 90423081 is 18032409.

It is not a de Polignac number, because 90423081 - 2² = 90423077 is a prime.

It is a super-2 number, since 2×90423081² = 16352667155065122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (90423083) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53410 + ... + 55076.

It is an arithmetic number, because the mean of its divisors is an integer number (3327660).

Almost surely, 2^90423081 is an apocalyptic number.

It is an amenable number.

90423081 is a deficient number, since it is larger than the sum of its proper divisors (69304599).

90423081 is a wasteful number, since it uses less digits than its factorization.

90423081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731 (or 1718 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 90423081 is about 9509.1051629478. The cubic root of 90423081 is about 448.8415983490.

The spelling of 90423081 in words is "ninety million, four hundred twenty-three thousand, eighty-one".