217300090 has 64 divisors (see below), whose sum is σ = 470292480. Its totient is φ = 70678080.

The previous prime is 217300087. The next prime is 217300099. The reversal of 217300090 is 90003712.

It is a super-2 number, since 2×217300090² = 94438658228016200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217300099) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223305 + ... + 224275.

It is an arithmetic number, because the mean of its divisors is an integer number (7348320).

Almost surely, 2^217300090 is an apocalyptic number.

217300090 is an abundant number, since it is smaller than the sum of its proper divisors (252992390).

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

217300090 is a wasteful number, since it uses less digits than its factorization.

217300090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 217300090 is about 14741.1020619220. The cubic root of 217300090 is about 601.2013799087.

The spelling of 217300090 in words is "two hundred seventeen million, three hundred thousand, ninety".