1640017864 has 16 divisors (see below), whose sum is σ = 3075572700. Its totient is φ = 819865152.

The previous prime is 1640017861. The next prime is 1640017903. The reversal of 1640017864 is 4687100461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1612664964 + 27352900 = 40158^2 + 5230^2 .

It is not an unprimeable number, because it can be changed into a prime (1640017861) 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, 42454 + ... + 71290.

Almost surely, 2^1640017864 is an apocalyptic number.

It is an amenable number.

1640017864 is a deficient number, since it is larger than the sum of its proper divisors (1435554836).

1640017864 is a wasteful number, since it uses less digits than its factorization.

1640017864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35952 (or 35948 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 1640017864 is about 40497.1340220515. The cubic root of 1640017864 is about 1179.2779897967.

The spelling of 1640017864 in words is "one billion, six hundred forty million, seventeen thousand, eight hundred sixty-four".