78116291 has 4 divisors (see below), whose sum is σ = 85217784. Its totient is φ = 71014800.

The previous prime is 78116281. The next prime is 78116299. The reversal of 78116291 is 19261187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78116291 - 2¹⁴ = 78099907 is a prime.

It is a super-2 number, since 2×78116291² = 12204309839193362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78116299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3550730 + ... + 3550751.

It is an arithmetic number, because the mean of its divisors is an integer number (21304446).

Almost surely, 2^78116291 is an apocalyptic number.

78116291 is a deficient number, since it is larger than the sum of its proper divisors (7101493).

78116291 is a wasteful number, since it uses less digits than its factorization.

78116291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7101492.

The product of its digits is 6048, while the sum is 35.

The square root of 78116291 is about 8838.3420956648. The cubic root of 78116291 is about 427.4781010863.

The spelling of 78116291 in words is "seventy-eight million, one hundred sixteen thousand, two hundred ninety-one".