90638997 has 4 divisors (see below), whose sum is σ = 120852000. Its totient is φ = 60425996.

The previous prime is 90638971. The next prime is 90639001. The reversal of 90638997 is 79983609.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90638997 - 2¹⁰ = 90637973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90638297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15106497 + ... + 15106502.

It is an arithmetic number, because the mean of its divisors is an integer number (30213000).

Almost surely, 2^90638997 is an apocalyptic number.

It is an amenable number.

90638997 is a deficient number, since it is larger than the sum of its proper divisors (30213003).

90638997 is a wasteful number, since it uses less digits than its factorization.

90638997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30213002.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 90638997 is about 9520.4515124021. The cubic root of 90638997 is about 449.1985685928.

It can be divided in two parts, 906 and 38997, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 90638997 in words is "ninety million, six hundred thirty-eight thousand, nine hundred ninety-seven".