71420218 has 16 divisors (see below), whose sum is σ = 110824704. Its totient is φ = 34483680.

The previous prime is 71420197. The next prime is 71420233. The reversal of 71420218 is 81202417.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 71420192 and 71420201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37321 + ... + 39187.

It is an arithmetic number, because the mean of its divisors is an integer number (6926544).

Almost surely, 2^71420218 is an apocalyptic number.

71420218 is a deficient number, since it is larger than the sum of its proper divisors (39404486).

71420218 is a wasteful number, since it uses less digits than its factorization.

71420218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 71420218 is about 8451.0483373366. The cubic root of 71420218 is about 414.8970916270.

The spelling of 71420218 in words is "seventy-one million, four hundred twenty thousand, two hundred eighteen".