78966381 has 8 divisors (see below), whose sum is σ = 113387680. Its totient is φ = 48594672.

The previous prime is 78966379. The next prime is 78966397. The reversal of 78966381 is 18366987.

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

It is not a de Polignac number, because 78966381 - 2¹ = 78966379 is a prime.

It is a super-2 number, since 2×78966381² = 12471378656474322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78966381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78966311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1012351 + ... + 1012428.

It is an arithmetic number, because the mean of its divisors is an integer number (14173460).

Almost surely, 2^78966381 is an apocalyptic number.

It is an amenable number.

78966381 is a deficient number, since it is larger than the sum of its proper divisors (34421299).

78966381 is a wasteful number, since it uses less digits than its factorization.

78966381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024795.

The product of its digits is 435456, while the sum is 48.

The square root of 78966381 is about 8886.3029995606. The cubic root of 78966381 is about 429.0231674993.

The spelling of 78966381 in words is "seventy-eight million, nine hundred sixty-six thousand, three hundred eighty-one".