172331540 has 24 divisors (see below), whose sum is σ = 363065640. Its totient is φ = 68709888.

The previous prime is 172331531. The next prime is 172331557. The reversal of 172331540 is 45133271.

It can be written as a sum of positive squares in 4 ways, for example, as 1976836 + 170354704 = 1406^2 + 13052^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7505 + ... + 20024.

It is an arithmetic number, because the mean of its divisors is an integer number (15127735).

Almost surely, 2^172331540 is an apocalyptic number.

172331540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172331540 is an abundant number, since it is smaller than the sum of its proper divisors (190734100).

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

172331540 is a wasteful number, since it uses less digits than its factorization.

172331540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27851 (or 27849 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 172331540 is about 13127.5108074608. The cubic root of 172331540 is about 556.4868714692.

The spelling of 172331540 in words is "one hundred seventy-two million, three hundred thirty-one thousand, five hundred forty".