71678418 has 16 divisors (see below), whose sum is σ = 163836480. Its totient is φ = 20479536.

The previous prime is 71678413. The next prime is 71678437. The reversal of 71678418 is 81487617.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1706629 = 71678418 / (7 + 1 + 6 + 7 + 8 + 4 + 1 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 71678418.

It is not an unprimeable number, because it can be changed into a prime (71678413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853273 + ... + 853356.

It is an arithmetic number, because the mean of its divisors is an integer number (10239780).

Almost surely, 2^71678418 is an apocalyptic number.

71678418 is an abundant number, since it is smaller than the sum of its proper divisors (92158062).

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

71678418 is a wasteful number, since it uses less digits than its factorization.

71678418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706641.

The product of its digits is 75264, while the sum is 42.

The square root of 71678418 is about 8466.3107667980. The cubic root of 71678418 is about 415.3964721265.

The spelling of 71678418 in words is "seventy-one million, six hundred seventy-eight thousand, four hundred eighteen".