71806863406 has 16 divisors (see below), whose sum is σ = 111283806816. Its totient is φ = 34723882656.

The previous prime is 71806863377. The next prime is 71806863409. The reversal of 71806863406 is 60436860817.

It is a self number, because there is not a number n which added to its sum of digits gives 71806863406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71806863409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2892921 + ... + 2917636.

It is an arithmetic number, because the mean of its divisors is an integer number (6955237926).

Almost surely, 2^71806863406 is an apocalyptic number.

71806863406 is a deficient number, since it is larger than the sum of its proper divisors (39476943410).

71806863406 is a wasteful number, since it uses less digits than its factorization.

71806863406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5810763.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 71806863406 in words is "seventy-one billion, eight hundred six million, eight hundred sixty-three thousand, four hundred six".