172871730 has 24 divisors (see below), whose sum is σ = 449466732. Its totient is φ = 46099104.

The previous prime is 172871729. The next prime is 172871753. The reversal of 172871730 is 37178271.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 166952241 + 5919489 = 12921^2 + 2433^2 .

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, 960309 + ... + 960488.

Almost surely, 2^172871730 is an apocalyptic number.

172871730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172871730 is an abundant number, since it is smaller than the sum of its proper divisors (276595002).

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

172871730 is a wasteful number, since it uses less digits than its factorization.

172871730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920810 (or 1920807 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

The square root of 172871730 is about 13148.0694400357. The cubic root of 172871730 is about 557.0677190866.

The spelling of 172871730 in words is "one hundred seventy-two million, eight hundred seventy-one thousand, seven hundred thirty".