90019810 has 16 divisors (see below), whose sum is σ = 162154296. Its totient is φ = 35981568.

The previous prime is 90019771. The next prime is 90019817. The reversal of 90019810 is 1891009.

It can be written as a sum of positive squares in 4 ways, for example, as 62425801 + 27594009 = 7901^2 + 5253^2 .

It is a super-2 number, since 2×90019810² = 16207132384872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90019817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17002 + ... + 21658.

Almost surely, 2^90019810 is an apocalyptic number.

90019810 is a deficient number, since it is larger than the sum of its proper divisors (72134486).

90019810 is a wasteful number, since it uses less digits than its factorization.

90019810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6597.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 90019810 is about 9487.8770017323. The cubic root of 90019810 is about 448.1733524762.

The spelling of 90019810 in words is "ninety million, nineteen thousand, eight hundred ten".