68278405 has 8 divisors (see below), whose sum is σ = 88236792. Its totient is φ = 50420928.

The previous prime is 68278369. The next prime is 68278423. The reversal of 68278405 is 50487286.

It can be written as a sum of positive squares in 4 ways, for example, as 2765569 + 65512836 = 1663^2 + 8094^2 .

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 68278405 - 2¹⁷ = 68147333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525154 + ... + 525283.

It is an arithmetic number, because the mean of its divisors is an integer number (11029599).

Almost surely, 2^68278405 is an apocalyptic number.

68278405 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68278405 is a deficient number, since it is larger than the sum of its proper divisors (19958387).

68278405 is a wasteful number, since it uses less digits than its factorization.

68278405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050455.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 68278405 is about 8263.0747908996. The cubic root of 68278405 is about 408.7217875891.

The spelling of 68278405 in words is "sixty-eight million, two hundred seventy-eight thousand, four hundred five".