265728540 has 192 divisors, whose sum is σ = 937681920. Its totient is φ = 54620160.

The previous prime is 265728539. The next prime is 265728571. The reversal of 265728540 is 45827562.

It is a super-2 number, since 2×265728540² = 141223313941063200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 521806 + ... + 522314.

It is an arithmetic number, because the mean of its divisors is an integer number (4883760).

Almost surely, 2^265728540 is an apocalyptic number.

265728540 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 265728540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (468840960).

265728540 is an abundant number, since it is smaller than the sum of its proper divisors (671953380).

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

265728540 is a wasteful number, since it uses less digits than its factorization.

265728540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 265728540 is about 16301.1821657204. The cubic root of 265728540 is about 642.9039101073.

The spelling of 265728540 in words is "two hundred sixty-five million, seven hundred twenty-eight thousand, five hundred forty".