1640164028 has 12 divisors (see below), whose sum is σ = 2887897320. Its totient is φ = 815050512.

The previous prime is 1640163989. The next prime is 1640164033. The reversal of 1640164028 is 8204610461.

It is a junction number, because it is equal to n+sod(n) for n = 1640163985 and 1640164003.

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, 1257143 + ... + 1258446.

It is an arithmetic number, because the mean of its divisors is an integer number (240658110).

Almost surely, 2^1640164028 is an apocalyptic number.

It is an amenable number.

1640164028 is a deficient number, since it is larger than the sum of its proper divisors (1247733292).

1640164028 is a wasteful number, since it uses less digits than its factorization.

1640164028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515756 (or 2515754 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1640164028 is about 40498.9386033758. The cubic root of 1640164028 is about 1179.3130225183.

Adding to 1640164028 its reverse (8204610461), we get a palindrome (9844774489).

The spelling of 1640164028 in words is "one billion, six hundred forty million, one hundred sixty-four thousand, twenty-eight".