90719990 has 24 divisors (see below), whose sum is σ = 173472192. Its totient is φ = 34152320.

The previous prime is 90719987. The next prime is 90720023. The reversal of 90719990 is 9991709.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12806 + ... + 18585.

It is an arithmetic number, because the mean of its divisors is an integer number (7228008).

Almost surely, 2^90719990 is an apocalyptic number.

90719990 is a deficient number, since it is larger than the sum of its proper divisors (82752202).

90719990 is a wasteful number, since it uses less digits than its factorization.

90719990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31432 (or 31415 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 90719990 is about 9524.7041948819. The cubic root of 90719990 is about 449.3323267233.

The spelling of 90719990 in words is "ninety million, seven hundred nineteen thousand, nine hundred ninety".