71240643402 has 16 divisors (see below), whose sum is σ = 142510205952. Its totient is φ = 23742061280.

The previous prime is 71240643389. The next prime is 71240643421. The reversal of 71240643402 is 20434604217.

It is a super-2 number, since 2×71240643402² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1172874 + ... + 1232117.

It is an arithmetic number, because the mean of its divisors is an integer number (8906887872).

Almost surely, 2^71240643402 is an apocalyptic number.

71240643402 is an abundant number, since it is smaller than the sum of its proper divisors (71269562550).

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

71240643402 is a wasteful number, since it uses less digits than its factorization.

71240643402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409933.

The product of its (nonzero) digits is 32256, while the sum is 33.

The spelling of 71240643402 in words is "seventy-one billion, two hundred forty million, six hundred forty-three thousand, four hundred two".