264550640 has 20 divisors (see below), whose sum is σ = 615080424. Its totient is φ = 105820224.

The previous prime is 264550609. The next prime is 264550679. The reversal of 264550640 is 46055462.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×264550640² = 139974082248819200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 264550597 and 264550606.

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, 1653362 + ... + 1653521.

Almost surely, 2^264550640 is an apocalyptic number.

264550640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

264550640 is an abundant number, since it is smaller than the sum of its proper divisors (350529784).

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

264550640 is a wasteful number, since it uses less digits than its factorization.

264550640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306896 (or 3306890 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 264550640 is about 16265.0127574497. The cubic root of 264550640 is about 641.9525655375.

The spelling of 264550640 in words is "two hundred sixty-four million, five hundred fifty thousand, six hundred forty".