1687898564 has 12 divisors (see below), whose sum is σ = 3222351888. Its totient is φ = 767226600.

The previous prime is 1687898521. The next prime is 1687898581. The reversal of 1687898564 is 4658987861.

1687898564 = 4336² + 4337² + ... + 4423².

It is a junction number, because it is equal to n+sod(n) for n = 1687898497 and 1687898506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19180622 + ... + 19180709.

It is an arithmetic number, because the mean of its divisors is an integer number (268529324).

Almost surely, 2^1687898564 is an apocalyptic number.

It is an amenable number.

1687898564 is a deficient number, since it is larger than the sum of its proper divisors (1534453324).

1687898564 is a wasteful number, since it uses less digits than its factorization.

1687898564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38361346 (or 38361344 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 62.

The square root of 1687898564 is about 41084.0426929970. The cubic root of 1687898564 is about 1190.6445121034.

The spelling of 1687898564 in words is "one billion, six hundred eighty-seven million, eight hundred ninety-eight thousand, five hundred sixty-four".