1913978568 has 16 divisors (see below), whose sum is σ = 4784946480. Its totient is φ = 637992848.

The previous prime is 1913978567. The next prime is 1913978579. The reversal of 1913978568 is 8658793191.

It is not an unprimeable number, because it can be changed into a prime (1913978567) 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, 39874530 + ... + 39874577.

It is an arithmetic number, because the mean of its divisors is an integer number (299059155).

Almost surely, 2^1913978568 is an apocalyptic number.

It is an amenable number.

1913978568 is an abundant number, since it is smaller than the sum of its proper divisors (2870967912).

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

1913978568 is a wasteful number, since it uses less digits than its factorization.

1913978568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79749116 (or 79749112 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 57.

The square root of 1913978568 is about 43749.0407666271. The cubic root of 1913978568 is about 1241.5923369245.

The spelling of 1913978568 in words is "one billion, nine hundred thirteen million, nine hundred seventy-eight thousand, five hundred sixty-eight".