172973808 has 120 divisors (see below), whose sum is σ = 557274848. Its totient is φ = 49061376.

The previous prime is 172973803. The next prime is 172973809. The reversal of 172973808 is 808379271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172973803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157710 + ... + 158802.

Almost surely, 2^172973808 is an apocalyptic number.

172973808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172973808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278637424).

172973808 is an abundant number, since it is smaller than the sum of its proper divisors (384301040).

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

172973808 is a wasteful number, since it uses less digits than its factorization.

172973808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271 (or 1262 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 172973808 is about 13151.9507298347. The cubic root of 172973808 is about 557.1773440473.

The spelling of 172973808 in words is "one hundred seventy-two million, nine hundred seventy-three thousand, eight hundred eight".