78443813 has 8 divisors (see below), whose sum is σ = 90024000. Its totient is φ = 66957120.

The previous prime is 78443791. The next prime is 78443821. The reversal of 78443813 is 31834487.

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

It is a cyclic number.

It is not a de Polignac number, because 78443813 - 2⁶ = 78443749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78443843) 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, 21563 + ... + 24936.

It is an arithmetic number, because the mean of its divisors is an integer number (11253000).

Almost surely, 2^78443813 is an apocalyptic number.

It is an amenable number.

78443813 is a deficient number, since it is larger than the sum of its proper divisors (11580187).

78443813 is a wasteful number, since it uses less digits than its factorization.

78443813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46747.

The product of its digits is 64512, while the sum is 38.

The square root of 78443813 is about 8856.8511898981. The cubic root of 78443813 is about 428.0747041844.

The spelling of 78443813 in words is "seventy-eight million, four hundred forty-three thousand, eight hundred thirteen".