90869805 has 24 divisors (see below), whose sum is σ = 169624728. Its totient is φ = 44735616.

The previous prime is 90869797. The next prime is 90869833. The reversal of 90869805 is 50896809.

It can be written as a sum of positive squares in 4 ways, for example, as 6487209 + 84382596 = 2547^2 + 9186^2 .

It is not a de Polignac number, because 90869805 - 2³ = 90869797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77082 + ... + 78251.

It is an arithmetic number, because the mean of its divisors is an integer number (7067697).

Almost surely, 2^90869805 is an apocalyptic number.

It is an amenable number.

90869805 is a deficient number, since it is larger than the sum of its proper divisors (78754923).

90869805 is a wasteful number, since it uses less digits than its factorization.

90869805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155357 (or 155354 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 90869805 is about 9532.5654993816. The cubic root of 90869805 is about 449.5795331764.

The spelling of 90869805 in words is "ninety million, eight hundred sixty-nine thousand, eight hundred five".