90209910 has 128 divisors (see below), whose sum is σ = 272056320. Its totient is φ = 18665856.

The previous prime is 90209909. The next prime is 90209927. The reversal of 90209910 is 1990209.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 91279 + ... + 92261.

It is an arithmetic number, because the mean of its divisors is an integer number (2125440).

Almost surely, 2^90209910 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90209910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136028160).

90209910 is an abundant number, since it is smaller than the sum of its proper divisors (181846410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90209910 is a wasteful number, since it uses less digits than its factorization.

90209910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 90209910 is about 9497.8897656269. The cubic root of 90209910 is about 448.4886084635.

It can be divided in two parts, 90209 and 910, that added together give a palindrome (91119).

The spelling of 90209910 in words is "ninety million, two hundred nine thousand, nine hundred ten".