1215717968 has 20 divisors (see below), whose sum is σ = 2358974388. Its totient is φ = 606950400.

The previous prime is 1215717967. The next prime is 1215717977. The reversal of 1215717968 is 8697175121.

It can be written as a sum of positive squares in 2 ways, for example, as 874503184 + 341214784 = 29572^2 + 18472^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215717967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45683 + ... + 67218.

Almost surely, 2^1215717968 is an apocalyptic number.

It is an amenable number.

1215717968 is a deficient number, since it is larger than the sum of its proper divisors (1143256420).

1215717968 is a wasteful number, since it uses less digits than its factorization.

1215717968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113582 (or 113576 counting only the distinct ones).

The product of its digits is 211680, while the sum is 47.

The square root of 1215717968 is about 34867.1474026769. The cubic root of 1215717968 is about 1067.2781339576.

The spelling of 1215717968 in words is "one billion, two hundred fifteen million, seven hundred seventeen thousand, nine hundred sixty-eight".