8213945713820 has 72 divisors (see below), whose sum is σ = 21889631982960. Its totient is φ = 2560190868480.

The previous prime is 8213945713819. The next prime is 8213945713847. The reversal of 8213945713820 is 283175493128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 380970005 + ... + 380991564.

It is an arithmetic number, because the mean of its divisors is an integer number (304022666430).

Almost surely, 2^{8213945713820} is an apocalyptic number.

It is an amenable number.

8213945713820 is an abundant number, since it is smaller than the sum of its proper divisors (13675686269140).

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

8213945713820 is a wasteful number, since it uses less digits than its factorization.

8213945713820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761961603 (or 761961594 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 8213945713820 in words is "eight trillion, two hundred thirteen billion, nine hundred forty-five million, seven hundred thirteen thousand, eight hundred twenty".