65312720 has 40 divisors (see below), whose sum is σ = 165659040. Its totient is φ = 23749760.

The previous prime is 65312717. The next prime is 65312773. The reversal of 65312720 is 2721356.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 65312720.

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, 36230 + ... + 37989.

It is an arithmetic number, because the mean of its divisors is an integer number (4141476).

Almost surely, 2^65312720 is an apocalyptic number.

It is an amenable number.

65312720 is an abundant number, since it is smaller than the sum of its proper divisors (100346320).

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

65312720 is a wasteful number, since it uses less digits than its factorization.

65312720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74243 (or 74237 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 65312720 is about 8081.6285487518. The cubic root of 65312720 is about 402.7163452491.

The spelling of 65312720 in words is "sixty-five million, three hundred twelve thousand, seven hundred twenty".