78953966 has 16 divisors (see below), whose sum is σ = 145761504. Its totient is φ = 31234464.

The previous prime is 78953957. The next prime is 78953969. The reversal of 78953966 is 66935987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78953969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216725 + ... + 217088.

It is an arithmetic number, because the mean of its divisors is an integer number (9110094).

Almost surely, 2^78953966 is an apocalyptic number.

78953966 is a deficient number, since it is larger than the sum of its proper divisors (66807538).

78953966 is a wasteful number, since it uses less digits than its factorization.

78953966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433835.

The product of its digits is 2449440, while the sum is 53.

The square root of 78953966 is about 8885.6044251362. The cubic root of 78953966 is about 429.0006828178. Note that the first 3 decimals are identical.

The spelling of 78953966 in words is "seventy-eight million, nine hundred fifty-three thousand, nine hundred sixty-six".