68172819 has 32 divisors (see below), whose sum is σ = 107326464. Its totient is φ = 37946880.

The previous prime is 68172809. The next prime is 68172857. The reversal of 68172819 is 91827186.

It is not a de Polignac number, because 68172819 - 2⁷ = 68172691 is a prime.

It is a super-2 number, since 2×68172819² = 9295066500813522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68172809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157227 + ... + 157659.

It is an arithmetic number, because the mean of its divisors is an integer number (3353952).

Almost surely, 2^68172819 is an apocalyptic number.

68172819 is a deficient number, since it is larger than the sum of its proper divisors (39153645).

68172819 is a wasteful number, since it uses less digits than its factorization.

68172819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827.

The product of its digits is 48384, while the sum is 42.

The square root of 68172819 is about 8256.6832929452. The cubic root of 68172819 is about 408.5109958902.

The spelling of 68172819 in words is "sixty-eight million, one hundred seventy-two thousand, eight hundred nineteen".