172166540 has 48 divisors (see below), whose sum is σ = 444988992. Its totient is φ = 54487296.

The previous prime is 172166537. The next prime is 172166549. The reversal of 172166540 is 45661271.

It is a junction number, because it is equal to n+sod(n) for n = 172166497 and 172166506.

It is not an unprimeable number, because it can be changed into a prime (172166549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45479 + ... + 49118.

It is an arithmetic number, because the mean of its divisors is an integer number (9270604).

Almost surely, 2^172166540 is an apocalyptic number.

172166540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172166540 is an abundant number, since it is smaller than the sum of its proper divisors (272822452).

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

172166540 is a wasteful number, since it uses less digits than its factorization.

172166540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94626 (or 94624 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 172166540 is about 13121.2247903921. The cubic root of 172166540 is about 556.3092107151.

The spelling of 172166540 in words is "one hundred seventy-two million, one hundred sixty-six thousand, five hundred forty".