68172778 has 8 divisors (see below), whose sum is σ = 103271940. Its totient is φ = 33748800.

The previous prime is 68172773. The next prime is 68172781. The reversal of 68172778 is 87727186.

It can be written as a sum of positive squares in 2 ways, for example, as 44582329 + 23590449 = 6677^2 + 4857^2 .

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

It is not an unprimeable number, because it can be changed into a prime (68172773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168543 + ... + 168946.

Almost surely, 2^68172778 is an apocalyptic number.

68172778 is a deficient number, since it is larger than the sum of its proper divisors (35099162).

68172778 is a wasteful number, since it uses less digits than its factorization.

68172778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337592.

The product of its digits is 263424, while the sum is 46.

The square root of 68172778 is about 8256.6808101077. The cubic root of 68172778 is about 408.5109139956.

The spelling of 68172778 in words is "sixty-eight million, one hundred seventy-two thousand, seven hundred seventy-eight".