78991353 has 12 divisors (see below), whose sum is σ = 130398528. Its totient is φ = 45137880.

The previous prime is 78991321. The next prime is 78991373. The reversal of 78991353 is 35319987.

It is a happy number.

It is not a de Polignac number, because 78991353 - 2⁵ = 78991321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78991299 and 78991308.

It is not an unprimeable number, because it can be changed into a prime (78991373) 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 11 ways as a sum of consecutive naturals, for example, 626853 + ... + 626978.

It is an arithmetic number, because the mean of its divisors is an integer number (10866544).

Almost surely, 2^78991353 is an apocalyptic number.

It is an amenable number.

78991353 is a deficient number, since it is larger than the sum of its proper divisors (51407175).

78991353 is a wasteful number, since it uses less digits than its factorization.

78991353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253844 (or 1253841 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 78991353 is about 8887.7079722502. The cubic root of 78991353 is about 429.0683869005.

The spelling of 78991353 in words is "seventy-eight million, nine hundred ninety-one thousand, three hundred fifty-three".