172878747 has 8 divisors (see below), whose sum is σ = 231338256. Its totient is φ = 114835872.

The previous prime is 172878731. The next prime is 172878751. The reversal of 172878747 is 747878271.

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

It is not a de Polignac number, because 172878747 - 2⁴ = 172878731 is a prime.

It is a super-2 number, since 2×172878747² = 59774122328580018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172878747.

It is not an unprimeable number, because it can be changed into a prime (172878707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103188 + ... + 104849.

It is an arithmetic number, because the mean of its divisors is an integer number (28917282).

Almost surely, 2^172878747 is an apocalyptic number.

172878747 is a deficient number, since it is larger than the sum of its proper divisors (58459509).

172878747 is a wasteful number, since it uses less digits than its factorization.

172878747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208317.

The product of its digits is 1229312, while the sum is 51.

The square root of 172878747 is about 13148.3362825872. The cubic root of 172878747 is about 557.0752562575.

The spelling of 172878747 in words is "one hundred seventy-two million, eight hundred seventy-eight thousand, seven hundred forty-seven".