640500036 has 24 divisors (see below), whose sum is σ = 1630364064. Its totient is φ = 194090880.

The previous prime is 640500019. The next prime is 640500037. The reversal of 640500036 is 630005046.

It is a super-2 number, since 2×640500036² = 820480592232002592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640499979 and 640500015.

It is not an unprimeable number, because it can be changed into a prime (640500037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2426005 + ... + 2426268.

It is an arithmetic number, because the mean of its divisors is an integer number (67931836).

Almost surely, 2^640500036 is an apocalyptic number.

640500036 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

640500036 is an abundant number, since it is smaller than the sum of its proper divisors (989864028).

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

640500036 is a wasteful number, since it uses less digits than its factorization.

640500036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4852291 (or 4852289 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 640500036 is about 25308.1021809222. The cubic root of 640500036 is about 861.9982540254.

The spelling of 640500036 in words is "six hundred forty million, five hundred thousand, thirty-six".