90697909 has 4 divisors (see below), whose sum is σ = 93623680. Its totient is φ = 87772140.

The previous prime is 90697903. The next prime is 90697933. The reversal of 90697909 is 90979609.

It is a happy number.

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 90697909 - 2²³ = 82309301 is a prime.

It is a super-2 number, since 2×90697909² = 16452221393944562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90697903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1462839 + ... + 1462900.

It is an arithmetic number, because the mean of its divisors is an integer number (23405920).

Almost surely, 2^90697909 is an apocalyptic number.

It is an amenable number.

90697909 is a deficient number, since it is larger than the sum of its proper divisors (2925771).

90697909 is a wasteful number, since it uses less digits than its factorization.

90697909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925770.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 90697909 is about 9523.5449807307. The cubic root of 90697909 is about 449.2958683411.

The spelling of 90697909 in words is "ninety million, six hundred ninety-seven thousand, nine hundred nine".