68351778 has 48 divisors (see below), whose sum is σ = 170071200. Its totient is φ = 19621440.

The previous prime is 68351761. The next prime is 68351783. The reversal of 68351778 is 87715386.

68351778 is a `hidden beast` number, since 68 + 3 + 517 + 78 = 666.

It is a super-2 number, since 2×68351778² = 9343931111522568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5323 + ... + 12846.

It is an arithmetic number, because the mean of its divisors is an integer number (3543150).

Almost surely, 2^68351778 is an apocalyptic number.

68351778 is an abundant number, since it is smaller than the sum of its proper divisors (101719422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68351778 is a wasteful number, since it uses less digits than its factorization.

68351778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18207 (or 18204 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 68351778 is about 8267.5134109356. The cubic root of 68351778 is about 408.8681413685.

The spelling of 68351778 in words is "sixty-eight million, three hundred fifty-one thousand, seven hundred seventy-eight".