172281840 has 40 divisors (see below), whose sum is σ = 534074448. Its totient is φ = 45941760.

The previous prime is 172281833. The next prime is 172281841. The reversal of 172281840 is 48182271.

It is a happy number.

172281840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172281841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358681 + ... + 359160.

Almost surely, 2^172281840 is an apocalyptic number.

172281840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172281840 is an abundant number, since it is smaller than the sum of its proper divisors (361792608).

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

172281840 is a wasteful number, since it uses less digits than its factorization.

172281840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717857 (or 717851 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 172281840 is about 13125.6176997504. The cubic root of 172281840 is about 556.4333698356.

The spelling of 172281840 in words is "one hundred seventy-two million, two hundred eighty-one thousand, eight hundred forty".