265640500 has 24 divisors (see below), whose sum is σ = 580159944. Its totient is φ = 106256000.

The previous prime is 265640491. The next prime is 265640509. The reversal of 265640500 is 5046562.

It is an interprime number because it is at equal distance from previous prime (265640491) and next prime (265640509).

It can be written as a sum of positive squares in 4 ways, for example, as 71707024 + 193933476 = 8468^2 + 13926^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265640509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265141 + ... + 266140.

It is an arithmetic number, because the mean of its divisors is an integer number (24173331).

Almost surely, 2^265640500 is an apocalyptic number.

265640500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265640500 is an abundant number, since it is smaller than the sum of its proper divisors (314519444).

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

265640500 is a wasteful number, since it uses less digits than its factorization.

265640500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531300 (or 531288 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 265640500 is about 16298.4815243629. The cubic root of 265640500 is about 642.8329009083.

The spelling of 265640500 in words is "two hundred sixty-five million, six hundred forty thousand, five hundred".