68782405 has 4 divisors (see below), whose sum is σ = 82538892. Its totient is φ = 55025920.

The previous prime is 68782387. The next prime is 68782411. The reversal of 68782405 is 50428786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50428786 = 2 ⋅25214393.

It can be written as a sum of positive squares in 2 ways, for example, as 27604516 + 41177889 = 5254^2 + 6417^2 .

It is not a de Polignac number, because 68782405 - 2⁷ = 68782277 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 6878236 + ... + 6878245.

It is an arithmetic number, because the mean of its divisors is an integer number (20634723).

Almost surely, 2^68782405 is an apocalyptic number.

It is an amenable number.

68782405 is a deficient number, since it is larger than the sum of its proper divisors (13756487).

68782405 is a wasteful number, since it uses less digits than its factorization.

68782405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13756486.

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

The square root of 68782405 is about 8293.5158407035. The cubic root of 68782405 is about 409.7249890832.

The spelling of 68782405 in words is "sixty-eight million, seven hundred eighty-two thousand, four hundred five".