165490290 has 256 divisors, whose sum is σ = 544112640. Its totient is φ = 35411904.

The previous prime is 165490229. The next prime is 165490301. The reversal of 165490290 is 92094561.

165490290 is a `hidden beast` number, since 165 + 490 + 2 + 9 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3521047 + ... + 3521093.

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

Almost surely, 2^165490290 is an apocalyptic number.

165490290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 165490290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272056320).

165490290 is an abundant number, since it is smaller than the sum of its proper divisors (378622350).

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

165490290 is an equidigital number, since it uses as much as digits as its factorization.

165490290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 165490290 is about 12864.3029348659. The cubic root of 165490290 is about 549.0233798159.

The spelling of 165490290 in words is "one hundred sixty-five million, four hundred ninety thousand, two hundred ninety".