8157668 has 6 divisors (see below), whose sum is σ = 14275926. Its totient is φ = 4078832.

The previous prime is 8157641. The next prime is 8157673. The reversal of 8157668 is 8667518.

8157668 is digitally balanced in base 5, 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 only one way, i.e., 7795264 + 362404 = 2792^2 + 602^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1019705 + ... + 1019712.

It is an arithmetic number, because the mean of its divisors is an integer number (2379321).

Almost surely, 2^8157668 is an apocalyptic number.

It is an amenable number.

8157668 is a deficient number, since it is larger than the sum of its proper divisors (6118258).

8157668 is a wasteful number, since it uses less digits than its factorization.

8157668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039421 (or 2039419 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 8157668 is about 2856.1631606055. The cubic root of 8157668 is about 201.3053616194.

The spelling of 8157668 in words is "eight million, one hundred fifty-seven thousand, six hundred sixty-eight".