78791291 has 8 divisors (see below), whose sum is σ = 79467024. Its totient is φ = 78118560.

The previous prime is 78791267. The next prime is 78791333. The reversal of 78791291 is 19219787.

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

It is a cyclic number.

It is not a de Polignac number, because 78791291 - 2⁶ = 78791227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78791201) 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, 116045 + ... + 116721.

It is an arithmetic number, because the mean of its divisors is an integer number (9933378).

Almost surely, 2^78791291 is an apocalyptic number.

78791291 is a deficient number, since it is larger than the sum of its proper divisors (675733).

78791291 is a wasteful number, since it uses less digits than its factorization.

78791291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501.

The product of its digits is 63504, while the sum is 44.

The square root of 78791291 is about 8876.4458540567. The cubic root of 78791291 is about 428.7058457365.

The spelling of 78791291 in words is "seventy-eight million, seven hundred ninety-one thousand, two hundred ninety-one".