90997719 has 24 divisors (see below), whose sum is σ = 130266240. Its totient is φ = 56486784.

The previous prime is 90997691. The next prime is 90997723. The reversal of 90997719 is 91779909.

It is not a de Polignac number, because 90997719 - 2⁸ = 90997463 is a prime.

It is a super-2 number, since 2×90997719² = 16561169726405922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90997769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88792 + ... + 89810.

It is an arithmetic number, because the mean of its divisors is an integer number (5427760).

Almost surely, 2^90997719 is an apocalyptic number.

90997719 is a deficient number, since it is larger than the sum of its proper divisors (39268521).

90997719 is a wasteful number, since it uses less digits than its factorization.

90997719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159 (or 1142 counting only the distinct ones).

The product of its (nonzero) digits is 321489, while the sum is 51.

The square root of 90997719 is about 9539.2724565346. The cubic root of 90997719 is about 449.7903863260.

The spelling of 90997719 in words is "ninety million, nine hundred ninety-seven thousand, seven hundred nineteen".