171216990 has 80 divisors (see below), whose sum is σ = 526169952. Its totient is φ = 39134016.

The previous prime is 171216973. The next prime is 171217001. The reversal of 171216990 is 99612171.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9429 + ... + 20768.

Almost surely, 2^171216990 is an apocalyptic number.

171216990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

171216990 is an abundant number, since it is smaller than the sum of its proper divisors (354952962).

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

171216990 is a wasteful number, since it uses less digits than its factorization.

171216990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30223 (or 30214 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The square root of 171216990 is about 13084.9910202491. The cubic root of 171216990 is about 555.2845874292.

The spelling of 171216990 in words is "one hundred seventy-one million, two hundred sixteen thousand, nine hundred ninety".