78427818 has 32 divisors (see below), whose sum is σ = 199182720. Its totient is φ = 22407840.

The previous prime is 78427787. The next prime is 78427823. The reversal of 78427818 is 81872487.

It is a super-2 number, since 2×78427818² = 12301845272482248, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103363 + ... + 104118.

It is an arithmetic number, because the mean of its divisors is an integer number (6224460).

Almost surely, 2^78427818 is an apocalyptic number.

78427818 is an abundant number, since it is smaller than the sum of its proper divisors (120754902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78427818 is a wasteful number, since it uses less digits than its factorization.

78427818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207499 (or 207493 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 78427818 is about 8855.9481705800. The cubic root of 78427818 is about 428.0456068383.

The spelling of 78427818 in words is "seventy-eight million, four hundred twenty-seven thousand, eight hundred eighteen".