90037991 has 8 divisors (see below), whose sum is σ = 90721200. Its totient is φ = 89357760.

The previous prime is 90037963. The next prime is 90037993. The reversal of 90037991 is 19973009.

It is a happy number.

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 90037991 - 2²² = 85843687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90037993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129956 + ... + 130646.

It is an arithmetic number, because the mean of its divisors is an integer number (11340150).

Almost surely, 2^90037991 is an apocalyptic number.

90037991 is a deficient number, since it is larger than the sum of its proper divisors (683209).

90037991 is a wasteful number, since it uses less digits than its factorization.

90037991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 90037991 is about 9488.8350707555. The cubic root of 90037991 is about 448.2035224696.

The spelling of 90037991 in words is "ninety million, thirty-seven thousand, nine hundred ninety-one".