172782216 has 24 divisors (see below), whose sum is σ = 467952030. Its totient is φ = 57594048.

The previous prime is 172782157. The next prime is 172782223. The reversal of 172782216 is 612287271.

It can be written as a sum of positive squares in only one way, i.e., 171872100 + 910116 = 13110^2 + 954^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1199805 + ... + 1199948.

Almost surely, 2^172782216 is an apocalyptic number.

It is an amenable number.

172782216 is an abundant number, since it is smaller than the sum of its proper divisors (295169814).

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

172782216 is a wasteful number, since it uses less digits than its factorization.

172782216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399765 (or 2399758 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 172782216 is about 13144.6649253604. The cubic root of 172782216 is about 556.9715515040.

The spelling of 172782216 in words is "one hundred seventy-two million, seven hundred eighty-two thousand, two hundred sixteen".