78208427 has 8 divisors (see below), whose sum is σ = 89808960. Its totient is φ = 67356360.

The previous prime is 78208411. The next prime is 78208433. The reversal of 78208427 is 72480287.

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 78208427 - 2⁴ = 78208411 is a prime.

It is a super-2 number, since 2×78208427² = 12233116107628658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78208727) 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, 186893 + ... + 187310.

It is an arithmetic number, because the mean of its divisors is an integer number (11226120).

Almost surely, 2^78208427 is an apocalyptic number.

78208427 is a deficient number, since it is larger than the sum of its proper divisors (11600533).

78208427 is a wasteful number, since it uses less digits than its factorization.

78208427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374233.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 78208427 is about 8843.5528493926. The cubic root of 78208427 is about 427.6461012436.

The spelling of 78208427 in words is "seventy-eight million, two hundred eight thousand, four hundred twenty-seven".