172021248 has 120 divisors (see below), whose sum is σ = 567494928. Its totient is φ = 49139712.

The previous prime is 172021219. The next prime is 172021271. The reversal of 172021248 is 842120271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29590 + ... + 34922.

Almost surely, 2^172021248 is an apocalyptic number.

172021248 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 172021248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283747464).

172021248 is an abundant number, since it is smaller than the sum of its proper divisors (395473680).

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

172021248 is an equidigital number, since it uses as much as digits as its factorization.

172021248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5364 (or 5345 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 172021248 is about 13115.6870959931. The cubic root of 172021248 is about 556.1526761849.

The spelling of 172021248 in words is "one hundred seventy-two million, twenty-one thousand, two hundred forty-eight".