815496656 has 60 divisors (see below), whose sum is σ = 1720961280. Its totient is φ = 374175360.

The previous prime is 815496653. The next prime is 815496659. The reversal of 815496656 is 656694518.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (815496653) and next prime (815496659).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815496653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 515675 + ... + 517253.

It is an arithmetic number, because the mean of its divisors is an integer number (28682688).

Almost surely, 2^815496656 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 815496656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860480640).

815496656 is an abundant number, since it is smaller than the sum of its proper divisors (905464624).

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

815496656 is a wasteful number, since it uses less digits than its factorization.

815496656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804 (or 1785 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 50.

The square root of 815496656 is about 28556.9020728790. The cubic root of 815496656 is about 934.2735665568.

The spelling of 815496656 in words is "eight hundred fifteen million, four hundred ninety-six thousand, six hundred fifty-six".