265540640 has 24 divisors (see below), whose sum is σ = 627340140. Its totient is φ = 106216192.

The previous prime is 265540633. The next prime is 265540643. The reversal of 265540640 is 46045562.

265540640 is digitally balanced in base 2, 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 2 ways, for example, as 256128016 + 9412624 = 16004^2 + 3068^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 265540597 and 265540606.

It is not an unprimeable number, because it can be changed into a prime (265540643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 829655 + ... + 829974.

Almost surely, 2^265540640 is an apocalyptic number.

265540640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265540640 is an abundant number, since it is smaller than the sum of its proper divisors (361799500).

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

265540640 is a wasteful number, since it uses less digits than its factorization.

265540640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659644 (or 1659636 counting only the distinct ones).

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

The square root of 265540640 is about 16295.4177608308. The cubic root of 265540640 is about 642.7523392231.

The spelling of 265540640 in words is "two hundred sixty-five million, five hundred forty thousand, six hundred forty".