172417640 has 16 divisors (see below), whose sum is σ = 387939780. Its totient is φ = 68967040.

The previous prime is 172417589. The next prime is 172417649. The reversal of 172417640 is 46714271.

It can be written as a sum of positive squares in 2 ways, for example, as 170406916 + 2010724 = 13054^2 + 1418^2 .

It is a junction number, because it is equal to n+sod(n) for n = 172417597 and 172417606.

It is not an unprimeable number, because it can be changed into a prime (172417649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155181 + ... + 2155260.

Almost surely, 2^172417640 is an apocalyptic number.

172417640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172417640 is an abundant number, since it is smaller than the sum of its proper divisors (215522140).

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

172417640 is a wasteful number, since it uses less digits than its factorization.

172417640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4310452 (or 4310448 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 172417640 is about 13130.7897706117. The cubic root of 172417640 is about 556.5795330569.

The spelling of 172417640 in words is "one hundred seventy-two million, four hundred seventeen thousand, six hundred forty".