815722960 has 40 divisors (see below), whose sum is σ = 2042447400. Its totient is φ = 301189632.

The previous prime is 815722939. The next prime is 815722993. The reversal of 815722960 is 69227518.

815722960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 24088464 + 791634496 = 4908^2 + 28136^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391135 + ... + 393214.

It is an arithmetic number, because the mean of its divisors is an integer number (51061185).

Almost surely, 2^815722960 is an apocalyptic number.

815722960 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

815722960 is an abundant number, since it is smaller than the sum of its proper divisors (1226724440).

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

815722960 is a wasteful number, since it uses less digits than its factorization.

815722960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784375 (or 784369 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 815722960 is about 28560.8641325853. The cubic root of 815722960 is about 934.3599802733.

The spelling of 815722960 in words is "eight hundred fifteen million, seven hundred twenty-two thousand, nine hundred sixty".