90293991 has 8 divisors (see below), whose sum is σ = 120489600. Its totient is φ = 60147192.

The previous prime is 90293941. The next prime is 90293993. The reversal of 90293991 is 19939209.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-90293991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90293993) 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, 7641 + ... + 15458.

It is an arithmetic number, because the mean of its divisors is an integer number (15061200).

Almost surely, 2^90293991 is an apocalyptic number.

90293991 is a deficient number, since it is larger than the sum of its proper divisors (30195609).

90293991 is a wasteful number, since it uses less digits than its factorization.

90293991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24405.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 90293991 is about 9502.3150337168. The cubic root of 90293991 is about 448.6279045451.

The spelling of 90293991 in words is "ninety million, two hundred ninety-three thousand, nine hundred ninety-one".