1640264536 has 16 divisors (see below), whose sum is σ = 3080571840. Its totient is φ = 818778720.

The previous prime is 1640264519. The next prime is 1640264581. The reversal of 1640264536 is 6354620461.

It is a junction number, because it is equal to n+sod(n) for n = 1640264495 and 1640264504.

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, 164035 + ... + 173746.

It is an arithmetic number, because the mean of its divisors is an integer number (192535740).

Almost surely, 2^1640264536 is an apocalyptic number.

It is an amenable number.

1640264536 is a deficient number, since it is larger than the sum of its proper divisors (1440307304).

1640264536 is a wasteful number, since it uses less digits than its factorization.

1640264536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338394 (or 338390 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 1640264536 is about 40500.1794563925. The cubic root of 1640264536 is about 1179.3371111603.

Adding to 1640264536 its reverse (6354620461), we get a palindrome (7994884997).

The spelling of 1640264536 in words is "one billion, six hundred forty million, two hundred sixty-four thousand, five hundred thirty-six".