90219805 has 32 divisors (see below), whose sum is σ = 120637440. Its totient is φ = 64733760.

The previous prime is 90219781. The next prime is 90219851. The reversal of 90219805 is 50891209.

It is not a de Polignac number, because 90219805 - 2⁹ = 90219293 is a prime.

It is a super-2 number, since 2×90219805² = 16279226428476050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 472260 + ... + 472450.

It is an arithmetic number, because the mean of its divisors is an integer number (3769920).

Almost surely, 2^90219805 is an apocalyptic number.

It is an amenable number.

90219805 is a deficient number, since it is larger than the sum of its proper divisors (30417635).

90219805 is a wasteful number, since it uses less digits than its factorization.

90219805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 90219805 is about 9498.4106565256. The cubic root of 90219805 is about 448.5050058953.

The spelling of 90219805 in words is "ninety million, two hundred nineteen thousand, eight hundred five".