78374813291 has 8 divisors (see below), whose sum is σ = 78688864800. Its totient is φ = 78060832768.

The previous prime is 78374813221. The next prime is 78374813327. The reversal of 78374813291 is 19231847387.

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 78374813291 - 2²⁶ = 78307704427 is a prime.

It is a super-2 number, since 2×78374813291² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78374813221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3918785 + ... + 3938733.

It is an arithmetic number, because the mean of its divisors is an integer number (9836108100).

Almost surely, 2^78374813291 is an apocalyptic number.

78374813291 is a deficient number, since it is larger than the sum of its proper divisors (314051509).

78374813291 is a wasteful number, since it uses less digits than its factorization.

78374813291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35493.

The product of its digits is 2032128, while the sum is 53.

The spelling of 78374813291 in words is "seventy-eight billion, three hundred seventy-four million, eight hundred thirteen thousand, two hundred ninety-one".