90695989 has 4 divisors (see below), whose sum is σ = 90824620. Its totient is φ = 90567360.

The previous prime is 90695981. The next prime is 90695993. The reversal of 90695989 is 98959609.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33814225 + 56881764 = 5815^2 + 7542^2 .

It is a cyclic number.

It is not a de Polignac number, because 90695989 - 2³ = 90695981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90695981) 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, 63252 + ... + 64669.

It is an arithmetic number, because the mean of its divisors is an integer number (22706155).

Almost surely, 2^90695989 is an apocalyptic number.

It is an amenable number.

90695989 is a deficient number, since it is larger than the sum of its proper divisors (128631).

90695989 is a wasteful number, since it uses less digits than its factorization.

90695989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128630.

The product of its (nonzero) digits is 1574640, while the sum is 55.

The square root of 90695989 is about 9523.4441773972. Note that the first 3 decimals coincide. The cubic root of 90695989 is about 449.2926979110.

The spelling of 90695989 in words is "ninety million, six hundred ninety-five thousand, nine hundred eighty-nine".