172278345 has 8 divisors (see below), whose sum is σ = 275645376. Its totient is φ = 91881776.

The previous prime is 172278343. The next prime is 172278361. The reversal of 172278345 is 543872271.

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

It is a cyclic number.

It is not a de Polignac number, because 172278345 - 2¹ = 172278343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172278343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5742597 + ... + 5742626.

It is an arithmetic number, because the mean of its divisors is an integer number (34455672).

Almost surely, 2^172278345 is an apocalyptic number.

172278345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172278345 is a deficient number, since it is larger than the sum of its proper divisors (103367031).

172278345 is a wasteful number, since it uses less digits than its factorization.

172278345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11485231.

The product of its digits is 94080, while the sum is 39.

The square root of 172278345 is about 13125.4845624838. The cubic root of 172278345 is about 556.4296071102.

The spelling of 172278345 in words is "one hundred seventy-two million, two hundred seventy-eight thousand, three hundred forty-five".