169720988 has 12 divisors (see below), whose sum is σ = 297855600. Its totient is φ = 84619392.

The previous prime is 169720987. The next prime is 169721011. The reversal of 169720988 is 889027961.

It is a super-2 number, since 2×169720988² = 57610427535392288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169720987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58688 + ... + 61511.

It is an arithmetic number, because the mean of its divisors is an integer number (24821300).

Almost surely, 2^169720988 is an apocalyptic number.

It is an amenable number.

169720988 is a deficient number, since it is larger than the sum of its proper divisors (128134612).

169720988 is a wasteful number, since it uses less digits than its factorization.

169720988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120556 (or 120554 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 169720988 is about 13027.7007948448. The cubic root of 169720988 is about 553.6625947953.

The spelling of 169720988 in words is "one hundred sixty-nine million, seven hundred twenty thousand, nine hundred eighty-eight".