172780138 has 8 divisors (see below), whose sum is σ = 259375140. Its totient is φ = 86321760.

The previous prime is 172780103. The next prime is 172780147. The reversal of 172780138 is 831087271.

It can be written as a sum of positive squares in 2 ways, for example, as 172213129 + 567009 = 13123^2 + 753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 172780097 and 172780106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30933 + ... + 36088.

Almost surely, 2^172780138 is an apocalyptic number.

172780138 is a deficient number, since it is larger than the sum of its proper divisors (86595002).

172780138 is a wasteful number, since it uses less digits than its factorization.

172780138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68312.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 172780138 is about 13144.5858816472. The cubic root of 172780138 is about 556.9693186516.

The spelling of 172780138 in words is "one hundred seventy-two million, seven hundred eighty thousand, one hundred thirty-eight".