78690726 has 24 divisors (see below), whose sum is σ = 174656664. Its totient is φ = 25590240.

The previous prime is 78690709. The next prime is 78690757. The reversal of 78690726 is 62709687.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52576 + ... + 54051.

It is an arithmetic number, because the mean of its divisors is an integer number (7277361).

Almost surely, 2^78690726 is an apocalyptic number.

78690726 is an abundant number, since it is smaller than the sum of its proper divisors (95965938).

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

78690726 is a wasteful number, since it uses less digits than its factorization.

78690726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106676 (or 106673 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 78690726 is about 8870.7793344215. The cubic root of 78690726 is about 428.5233756600.

The spelling of 78690726 in words is "seventy-eight million, six hundred ninety thousand, seven hundred twenty-six".