265499640 has 384 divisors, whose sum is σ = 1071144000. Its totient is φ = 58254336.

The previous prime is 265499639. The next prime is 265499657. The reversal of 265499640 is 46994562.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1534594 + ... + 1534766.

Almost surely, 2^265499640 is an apocalyptic number.

265499640 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 265499640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535572000).

265499640 is an abundant number, since it is smaller than the sum of its proper divisors (805644360).

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

265499640 is a wasteful number, since it uses less digits than its factorization.

265499640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 265499640 is about 16294.1596899012. The cubic root of 265499640 is about 642.7192567762.

The spelling of 265499640 in words is "two hundred sixty-five million, four hundred ninety-nine thousand, six hundred forty".