1640504144 has 20 divisors (see below), whose sum is σ = 3180067296. Its totient is φ = 819841632.

The previous prime is 1640504119. The next prime is 1640504189. The reversal of 1640504144 is 4414050461.

It is a congruent number.

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, 8717 + ... + 57939.

Almost surely, 2^1640504144 is an apocalyptic number.

It is an amenable number.

1640504144 is a deficient number, since it is larger than the sum of its proper divisors (1539563152).

1640504144 is a wasteful number, since it uses less digits than its factorization.

1640504144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51314 (or 51308 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 1640504144 is about 40503.1374587204. The cubic root of 1640504144 is about 1179.3945337776.

The spelling of 1640504144 in words is "one billion, six hundred forty million, five hundred four thousand, one hundred forty-four".