815320702228 has 12 divisors (see below), whose sum is σ = 1453732195860. Its totient is φ = 399968646272.

The previous prime is 815320702067. The next prime is 815320702289. The reversal of 815320702228 is 822207023518.

It can be written as a sum of positive squares in 2 ways, for example, as 503166072964 + 312154629264 = 709342^2 + 558708^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1922925973 + ... + 1922926396.

It is an arithmetic number, because the mean of its divisors is an integer number (121144349655).

Almost surely, 2^815320702228 is an apocalyptic number.

It is an amenable number.

815320702228 is a deficient number, since it is larger than the sum of its proper divisors (638411493632).

815320702228 is a wasteful number, since it uses less digits than its factorization.

815320702228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845852426 (or 3845852424 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 815320702228 in words is "eight hundred fifteen billion, three hundred twenty million, seven hundred two thousand, two hundred twenty-eight".