78996646 has 16 divisors (see below), whose sum is σ = 119709504. Its totient is φ = 39095784.

The previous prime is 78996641. The next prime is 78996677. The reversal of 78996646 is 64669987.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78996641) 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, 144145 + ... + 144691.

It is an arithmetic number, because the mean of its divisors is an integer number (7481844).

Almost surely, 2^78996646 is an apocalyptic number.

78996646 is a deficient number, since it is larger than the sum of its proper divisors (40712858).

78996646 is a wasteful number, since it uses less digits than its factorization.

78996646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155.

The product of its digits is 3919104, while the sum is 55.

The square root of 78996646 is about 8888.0057380720. The cubic root of 78996646 is about 429.0779702628.

The spelling of 78996646 in words is "seventy-eight million, nine hundred ninety-six thousand, six hundred forty-six".