71213478 has 16 divisors (see below), whose sum is σ = 162773760. Its totient is φ = 20346696.

The previous prime is 71213477. The next prime is 71213491. The reversal of 71213478 is 87431217.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71213477) 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, 847738 + ... + 847821.

It is an arithmetic number, because the mean of its divisors is an integer number (10173360).

Almost surely, 2^71213478 is an apocalyptic number.

71213478 is an abundant number, since it is smaller than the sum of its proper divisors (91560282).

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

71213478 is a wasteful number, since it uses less digits than its factorization.

71213478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695571.

The product of its digits is 9408, while the sum is 33.

The square root of 71213478 is about 8438.8078541936. The cubic root of 71213478 is about 414.4963707222.

The spelling of 71213478 in words is "seventy-one million, two hundred thirteen thousand, four hundred seventy-eight".