78434018 has 8 divisors (see below), whose sum is σ = 126701148. Its totient is φ = 36200304.

The previous prime is 78434003. The next prime is 78434029. The reversal of 78434018 is 81043487.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72199009 + 6235009 = 8497^2 + 2497^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1508321 + ... + 1508372.

Almost surely, 2^78434018 is an apocalyptic number.

78434018 is a deficient number, since it is larger than the sum of its proper divisors (48267130).

78434018 is a wasteful number, since it uses less digits than its factorization.

78434018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016708.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 78434018 is about 8856.2982108780. The cubic root of 78434018 is about 428.0568860540.

The spelling of 78434018 in words is "seventy-eight million, four hundred thirty-four thousand, eighteen".