78214218 has 32 divisors (see below), whose sum is σ = 163373760. Its totient is φ = 24931200.

The previous prime is 78214211. The next prime is 78214219. The reversal of 78214218 is 81241287.

It is a happy number.

It is a super-2 number, since 2×78214218² = 12234927794703048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78214211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16518 + ... + 20718.

It is an arithmetic number, because the mean of its divisors is an integer number (5105430).

Almost surely, 2^78214218 is an apocalyptic number.

78214218 is an abundant number, since it is smaller than the sum of its proper divisors (85159542).

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

78214218 is a wasteful number, since it uses less digits than its factorization.

78214218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4342.

The product of its digits is 7168, while the sum is 33.

The square root of 78214218 is about 8843.8802569913. The cubic root of 78214218 is about 427.6566561055.

The spelling of 78214218 in words is "seventy-eight million, two hundred fourteen thousand, two hundred eighteen".