265512540 has 48 divisors (see below), whose sum is σ = 744266880. Its totient is φ = 70724160.

The previous prime is 265512539. The next prime is 265512547. The reversal of 265512540 is 45215562.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 265512498 and 265512507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265512547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68371 + ... + 72149.

It is an arithmetic number, because the mean of its divisors is an integer number (15505560).

Almost surely, 2^265512540 is an apocalyptic number.

265512540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265512540 is an abundant number, since it is smaller than the sum of its proper divisors (478754340).

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

265512540 is a wasteful number, since it uses less digits than its factorization.

265512540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4962 (or 4960 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 265512540 is about 16294.5555324470. Note that the first 4 decimals coincide. The cubic root of 265512540 is about 642.7296660108.

The spelling of 265512540 in words is "two hundred sixty-five million, five hundred twelve thousand, five hundred forty".