1685634864 has 40 divisors (see below), whose sum is σ = 4610709360. Its totient is φ = 528826368.

The previous prime is 1685634859. The next prime is 1685634869. The reversal of 1685634864 is 4684365861.

It is an interprime number because it is at equal distance from previous prime (1685634859) and next prime (1685634869).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1685634869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1032049 + ... + 1033680.

It is an arithmetic number, because the mean of its divisors is an integer number (115267734).

Almost surely, 2^1685634864 is an apocalyptic number.

It is an amenable number.

1685634864 is an abundant number, since it is smaller than the sum of its proper divisors (2925074496).

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

1685634864 is a wasteful number, since it uses less digits than its factorization.

1685634864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065757 (or 2065751 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 51.

The square root of 1685634864 is about 41056.4838241172. The cubic root of 1685634864 is about 1190.1120022632.

The spelling of 1685634864 in words is "one billion, six hundred eighty-five million, six hundred thirty-four thousand, eight hundred sixty-four".