265464640 has 112 divisors (see below), whose sum is σ = 742200192. Its totient is φ = 88528896.

The previous prime is 265464631. The next prime is 265464691. The reversal of 265464640 is 46464562.

265464640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 265464640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81279 + ... + 84481.

Almost surely, 2^265464640 is an apocalyptic number.

265464640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265464640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371100096).

265464640 is an abundant number, since it is smaller than the sum of its proper divisors (476735552).

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

265464640 is a wasteful number, since it uses less digits than its factorization.

265464640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264 (or 3254 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 265464640 is about 16293.0856500541. The cubic root of 265464640 is about 642.6910129682.

The spelling of 265464640 in words is "two hundred sixty-five million, four hundred sixty-four thousand, six hundred forty".