815215730652 has 72 divisors (see below), whose sum is σ = 2109925673856. Its totient is φ = 265253101344.

The previous prime is 815215730617. The next prime is 815215730689. The reversal of 815215730652 is 256037512518.

815215730652 is a `hidden beast` number, since 8 + 1 + 5 + 21 + 573 + 0 + 6 + 52 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 815215730598 and 815215730607.

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, 2323783 + ... + 2651489.

It is an arithmetic number, because the mean of its divisors is an integer number (29304523248).

Almost surely, 2^815215730652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815215730652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054962836928).

815215730652 is an abundant number, since it is smaller than the sum of its proper divisors (1294709943204).

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

815215730652 is a wasteful number, since it uses less digits than its factorization.

815215730652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329367 (or 329362 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 815215730652 in words is "eight hundred fifteen billion, two hundred fifteen million, seven hundred thirty thousand, six hundred fifty-two".