1538911668 has 48 divisors (see below), whose sum is σ = 4130975744. Its totient is φ = 436773600.

The previous prime is 1538911607. The next prime is 1538911697. The reversal of 1538911668 is 8661198351.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47980 + ... + 73347.

Almost surely, 2^1538911668 is an apocalyptic number.

It is an amenable number.

1538911668 is an abundant number, since it is smaller than the sum of its proper divisors (2592064076).

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

1538911668 is a wasteful number, since it uses less digits than its factorization.

1538911668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121492 (or 121490 counting only the distinct ones).

The product of its digits is 311040, while the sum is 48.

The square root of 1538911668 is about 39228.9646562333. The cubic root of 1538911668 is about 1154.5282502144.

The spelling of 1538911668 in words is "one billion, five hundred thirty-eight million, nine hundred eleven thousand, six hundred sixty-eight".