90213805 has 32 divisors (see below), whose sum is σ = 125452800. Its totient is φ = 61588800.

The previous prime is 90213803. The next prime is 90213811. The reversal of 90213805 is 50831209.

It is not a de Polignac number, because 90213805 - 2¹ = 90213803 is a prime.

It is a super-2 number, since 2×90213805² = 16277061225156050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90213803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136566 + ... + 137224.

It is an arithmetic number, because the mean of its divisors is an integer number (3920400).

Almost surely, 2^90213805 is an apocalyptic number.

90213805 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

90213805 is a deficient number, since it is larger than the sum of its proper divisors (35238995).

90213805 is a wasteful number, since it uses less digits than its factorization.

90213805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 90213805 is about 9498.0948089604. The cubic root of 90213805 is about 448.4950631793.

The spelling of 90213805 in words is "ninety million, two hundred thirteen thousand, eight hundred five".