90869990 has 16 divisors (see below), whose sum is σ = 168842880. Its totient is φ = 35175360.

The previous prime is 90869953. The next prime is 90870007. The reversal of 90869990 is 9996809.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 146255 + ... + 146874.

It is an arithmetic number, because the mean of its divisors is an integer number (10552680).

Almost surely, 2^90869990 is an apocalyptic number.

90869990 is a deficient number, since it is larger than the sum of its proper divisors (77972890).

90869990 is a wasteful number, since it uses less digits than its factorization.

90869990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293167.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 90869990 is about 9532.5752029554. The cubic root of 90869990 is about 449.5798382728.

The spelling of 90869990 in words is "ninety million, eight hundred sixty-nine thousand, nine hundred ninety".