78680638 has 8 divisors (see below), whose sum is σ = 119683440. Its totient is φ = 38786160.

The previous prime is 78680621. The next prime is 78680639. The reversal of 78680638 is 83608687.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78680639) 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, 276903 + ... + 277186.

It is an arithmetic number, because the mean of its divisors is an integer number (14960430).

Almost surely, 2^78680638 is an apocalyptic number.

78680638 is a deficient number, since it is larger than the sum of its proper divisors (41002802).

78680638 is a wasteful number, since it uses less digits than its factorization.

78680638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554162.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 78680638 is about 8870.2107077566. The cubic root of 78680638 is about 428.5050629194.

The spelling of 78680638 in words is "seventy-eight million, six hundred eighty thousand, six hundred thirty-eight".