90690893 has 16 divisors (see below), whose sum is σ = 95266416. Its totient is φ = 86261760.

The previous prime is 90690889. The next prime is 90690923. The reversal of 90690893 is 39809609.

It can be written as a sum of positive squares in 8 ways, for example, as 20097289 + 70593604 = 4483^2 + 8402^2 .

It is a cyclic number.

It is not a de Polignac number, because 90690893 - 2² = 90690889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90690833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469805 + ... + 469997.

It is an arithmetic number, because the mean of its divisors is an integer number (5954151).

Almost surely, 2^90690893 is an apocalyptic number.

It is an amenable number.

90690893 is a deficient number, since it is larger than the sum of its proper divisors (4575523).

90690893 is a wasteful number, since it uses less digits than its factorization.

90690893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 90690893 is about 9523.1766233752. The cubic root of 90690893 is about 449.2842828440.

The spelling of 90690893 in words is "ninety million, six hundred ninety thousand, eight hundred ninety-three".