78496391 has 8 divisors (see below), whose sum is σ = 82993200. Its totient is φ = 74036160.

The previous prime is 78496387. The next prime is 78496409. The reversal of 78496391 is 19369487.

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

It is not a de Polignac number, because 78496391 - 2² = 78496387 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 (78496321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4670 + ... + 13371.

It is an arithmetic number, because the mean of its divisors is an integer number (10374150).

Almost surely, 2^78496391 is an apocalyptic number.

78496391 is a deficient number, since it is larger than the sum of its proper divisors (4496809).

78496391 is a wasteful number, since it uses less digits than its factorization.

78496391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18289.

The product of its digits is 326592, while the sum is 47.

The square root of 78496391 is about 8859.8189033411. The cubic root of 78496391 is about 428.1703237291.

It can be divided in two parts, 78496 and 391, that added together give a palindrome (78887).

The spelling of 78496391 in words is "seventy-eight million, four hundred ninety-six thousand, three hundred ninety-one".