264640648 has 8 divisors (see below), whose sum is σ = 496201230. Its totient is φ = 132320320.

The previous prime is 264640633. The next prime is 264640661. The reversal of 264640648 is 846046462.

264640648 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 245298244 + 19342404 = 15662^2 + 4398^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×264640648³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 264640648.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16540033 + ... + 16540048.

Almost surely, 2^264640648 is an apocalyptic number.

It is an amenable number.

264640648 is a deficient number, since it is larger than the sum of its proper divisors (231560582).

264640648 is a wasteful number, since it uses less digits than its factorization.

264640648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33080087 (or 33080083 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 264640648 is about 16267.7794428127. The cubic root of 264640648 is about 642.0253610708.

The spelling of 264640648 in words is "two hundred sixty-four million, six hundred forty thousand, six hundred forty-eight".