78656381 has 8 divisors (see below), whose sum is σ = 82749600. Its totient is φ = 74655280.

The previous prime is 78656363. The next prime is 78656401. The reversal of 78656381 is 18365687.

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

It is not a de Polignac number, because 78656381 - 2²² = 74462077 is a prime.

It is a super-2 number, since 2×78656381² = 12373652544034322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78656681) 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, 21275 + ... + 24696.

It is an arithmetic number, because the mean of its divisors is an integer number (10343700).

Almost surely, 2^78656381 is an apocalyptic number.

It is an amenable number.

78656381 is a deficient number, since it is larger than the sum of its proper divisors (4093219).

78656381 is a wasteful number, since it uses less digits than its factorization.

78656381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46059.

The product of its digits is 241920, while the sum is 44.

The square root of 78656381 is about 8868.8432729415. The cubic root of 78656381 is about 428.4610227932.

The spelling of 78656381 in words is "seventy-eight million, six hundred fifty-six thousand, three hundred eighty-one".