71212457640 has 64 divisors (see below), whose sum is σ = 213818693760. Its totient is φ = 18973871360.

The previous prime is 71212457639. The next prime is 71212457647. The reversal of 71212457640 is 4675421217.

It is not an unprimeable number, because it can be changed into a prime (71212457647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109524 + ... + 392963.

It is an arithmetic number, because the mean of its divisors is an integer number (3340917090).

Almost surely, 2^71212457640 is an apocalyptic number.

It is an amenable number.

71212457640 is an abundant number, since it is smaller than the sum of its proper divisors (142606236120).

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

71212457640 is a wasteful number, since it uses less digits than its factorization.

71212457640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503682 (or 503678 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

Adding to 71212457640 its reverse (4675421217), we get a palindrome (75887878857).

The spelling of 71212457640 in words is "seventy-one billion, two hundred twelve million, four hundred fifty-seven thousand, six hundred forty".