815388885 has 24 divisors (see below), whose sum is σ = 1414093824. Its totient is φ = 434642400.

The previous prime is 815388883. The next prime is 815388907. The reversal of 815388885 is 588883518.

815388885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 815388885 - 2¹ = 815388883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815388883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111244 + ... + 118346.

It is an arithmetic number, because the mean of its divisors is an integer number (58920576).

Almost surely, 2^815388885 is an apocalyptic number.

It is an amenable number.

815388885 is a deficient number, since it is larger than the sum of its proper divisors (598704939).

815388885 is a wasteful number, since it uses less digits than its factorization.

815388885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9665 (or 9662 counting only the distinct ones).

The product of its digits is 2457600, while the sum is 54.

The square root of 815388885 is about 28555.0150586548. The cubic root of 815388885 is about 934.2324088028.

The spelling of 815388885 in words is "eight hundred fifteen million, three hundred eighty-eight thousand, eight hundred eighty-five".