90663993 has 12 divisors (see below), whose sum is σ = 149667648. Its totient is φ = 51807960.

The previous prime is 90663983. The next prime is 90664003. The reversal of 90663993 is 39936609.

90663993 is a `hidden beast` number, since 9 + 0 + 6 + 639 + 9 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (90663983) and next prime (90664003).

It is not a de Polignac number, because 90663993 - 2⁴ = 90663977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90663983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 719493 + ... + 719618.

It is an arithmetic number, because the mean of its divisors is an integer number (12472304).

Almost surely, 2^90663993 is an apocalyptic number.

It is an amenable number.

90663993 is a deficient number, since it is larger than the sum of its proper divisors (59003655).

90663993 is a wasteful number, since it uses less digits than its factorization.

90663993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439124 (or 1439121 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 45.

The square root of 90663993 is about 9521.7641747735. The cubic root of 90663993 is about 449.2398574266.

The spelling of 90663993 in words is "ninety million, six hundred sixty-three thousand, nine hundred ninety-three".