172151320 has 64 divisors (see below), whose sum is σ = 440951040. Its totient is φ = 59875200.

The previous prime is 172151303. The next prime is 172151347. The reversal of 172151320 is 23151271.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 172151291 and 172151300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1615 + ... + 18625.

It is an arithmetic number, because the mean of its divisors is an integer number (6889860).

Almost surely, 2^172151320 is an apocalyptic number.

172151320 is a gapful number since it is divisible by the number (10) 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 172151320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220475520).

172151320 is an abundant number, since it is smaller than the sum of its proper divisors (268799720).

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

172151320 is a wasteful number, since it uses less digits than its factorization.

172151320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17056 (or 17052 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 172151320 is about 13120.6448012283. The cubic root of 172151320 is about 556.2928171392.

The spelling of 172151320 in words is "one hundred seventy-two million, one hundred fifty-one thousand, three hundred twenty".