78166427 has 8 divisors (see below), whose sum is σ = 78884352. Its totient is φ = 77452200.

The previous prime is 78166409. The next prime is 78166433. The reversal of 78166427 is 72466187.

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 78166427 - 2¹⁰ = 78165403 is a prime.

It is a super-2 number, since 2×78166427² = 12219980619892658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78166477) 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, 56498 + ... + 57864.

It is an arithmetic number, because the mean of its divisors is an integer number (9860544).

Almost surely, 2^78166427 is an apocalyptic number.

78166427 is a deficient number, since it is larger than the sum of its proper divisors (717925).

78166427 is a wasteful number, since it uses less digits than its factorization.

78166427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849.

The product of its digits is 112896, while the sum is 41.

The square root of 78166427 is about 8841.1779192594. The cubic root of 78166427 is about 427.5695351023.

The spelling of 78166427 in words is "seventy-eight million, one hundred sixty-six thousand, four hundred twenty-seven".