172099072 has 40 divisors (see below), whose sum is σ = 351903816. Its totient is φ = 84037632.

The previous prime is 172099063. The next prime is 172099091. The reversal of 172099072 is 270990271.

It is a super-2 number, since 2×172099072² = 59236181166522368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18108 + ... + 25924.

Almost surely, 2^172099072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172099072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175951908).

172099072 is an abundant number, since it is smaller than the sum of its proper divisors (179804744).

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

172099072 is an frugal number, since it uses more digits than its factorization.

172099072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878 (or 7862 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 172099072 is about 13118.6535894504. The cubic root of 172099072 is about 556.2365330746.

The spelling of 172099072 in words is "one hundred seventy-two million, ninety-nine thousand, seventy-two".