1939687568 has 80 divisors (see below), whose sum is σ = 4633870080. Its totient is φ = 765946368.

The previous prime is 1939687567. The next prime is 1939687661. The reversal of 1939687568 is 8657869391.

It is a happy number.

It is a super-2 number, since 2×1939687568² = 7524775722907509248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1939687568.

It is not an unprimeable number, because it can be changed into a prime (1939687567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1206221 + ... + 1207827.

It is an arithmetic number, because the mean of its divisors is an integer number (57923376).

Almost surely, 2^1939687568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1939687568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2316935040).

1939687568 is an abundant number, since it is smaller than the sum of its proper divisors (2694182512).

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

1939687568 is a wasteful number, since it uses less digits than its factorization.

1939687568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464 (or 2458 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 62.

The square root of 1939687568 is about 44041.8842467032. The cubic root of 1939687568 is about 1247.1267484407.

The spelling of 1939687568 in words is "one billion, nine hundred thirty-nine million, six hundred eighty-seven thousand, five hundred sixty-eight".