815668406 has 16 divisors (see below), whose sum is σ = 1426826400. Its totient is φ = 349571880.

The previous prime is 815668363. The next prime is 815668429. The reversal of 815668406 is 604866518.

815668406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 593825 + ... + 595196.

It is an arithmetic number, because the mean of its divisors is an integer number (89176650).

Almost surely, 2^815668406 is an apocalyptic number.

815668406 is a deficient number, since it is larger than the sum of its proper divisors (611157994).

815668406 is a wasteful number, since it uses less digits than its factorization.

815668406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189044 (or 1189030 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 815668406 is about 28559.9090684827. The cubic root of 815668406 is about 934.3391504029.

The spelling of 815668406 in words is "eight hundred fifteen million, six hundred sixty-eight thousand, four hundred six".