161683290 has 160 divisors (see below), whose sum is σ = 461666304. Its totient is φ = 40538880.

The previous prime is 161683279. The next prime is 161683309. The reversal of 161683290 is 92386161.

161683290 is a `hidden beast` number, since 1 + 616 + 8 + 32 + 9 + 0 = 666.

161683290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161683290² = 52282972530448200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1180102 + ... + 1180238.

Almost surely, 2^161683290 is an apocalyptic number.

161683290 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 161683290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230833152).

161683290 is an abundant number, since it is smaller than the sum of its proper divisors (299983014).

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

161683290 is a wasteful number, since it uses less digits than its factorization.

161683290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 161683290 is about 12715.4744307871. The cubic root of 161683290 is about 544.7806990193.

The spelling of 161683290 in words is "one hundred sixty-one million, six hundred eighty-three thousand, two hundred ninety".