65255640 has 32 divisors (see below), whose sum is σ = 195767280. Its totient is φ = 17401472.

The previous prime is 65255629. The next prime is 65255681. The reversal of 65255640 is 4655256.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271779 + ... + 272018.

Almost surely, 2^65255640 is an apocalyptic number.

65255640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65255640 is an abundant number, since it is smaller than the sum of its proper divisors (130511640).

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

65255640 is a wasteful number, since it uses less digits than its factorization.

65255640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543811 (or 543807 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 65255640 is about 8078.0963103939. The cubic root of 65255640 is about 402.5989931787.

The spelling of 65255640 in words is "sixty-five million, two hundred fifty-five thousand, six hundred forty".