78336431 has 8 divisors (see below), whose sum is σ = 78929760. Its totient is φ = 77745888.

The previous prime is 78336421. The next prime is 78336439. The reversal of 78336431 is 13463387.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78336431 is a prime.

It is a super-2 number, since 2×78336431² = 12273192843635522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78336391 and 78336400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78336439) 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, 107390 + ... + 108116.

It is an arithmetic number, because the mean of its divisors is an integer number (9866220).

Almost surely, 2^78336431 is an apocalyptic number.

78336431 is a deficient number, since it is larger than the sum of its proper divisors (593329).

78336431 is a wasteful number, since it uses less digits than its factorization.

78336431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393.

The product of its digits is 36288, while the sum is 35.

The square root of 78336431 is about 8850.7870271519. The cubic root of 78336431 is about 427.8792840184.

The spelling of 78336431 in words is "seventy-eight million, three hundred thirty-six thousand, four hundred thirty-one".