65440680 has 64 divisors (see below), whose sum is σ = 196862400. Its totient is φ = 17402880.

The previous prime is 65440621. The next prime is 65440691. The reversal of 65440680 is 8604456.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73840 + ... + 74720.

It is an arithmetic number, because the mean of its divisors is an integer number (3075975).

Almost surely, 2^65440680 is an apocalyptic number.

65440680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65440680 is an abundant number, since it is smaller than the sum of its proper divisors (131421720).

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

65440680 is a wasteful number, since it uses less digits than its factorization.

65440680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514 (or 1510 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 65440680 is about 8089.5413961485. The cubic root of 65440680 is about 402.9791729021.

The spelling of 65440680 in words is "sixty-five million, four hundred forty thousand, six hundred eighty".