65720287 has 4 divisors (see below), whose sum is σ = 65772256. Its totient is φ = 65668320.

The previous prime is 65720273. The next prime is 65720299. The reversal of 65720287 is 78202756.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65720287 is a prime.

It is a super-2 number, since 2×65720287² = 8638312246724738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65720257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24039 + ... + 26632.

It is an arithmetic number, because the mean of its divisors is an integer number (16443064).

Almost surely, 2^65720287 is an apocalyptic number.

65720287 is a deficient number, since it is larger than the sum of its proper divisors (51969).

65720287 is a wasteful number, since it uses less digits than its factorization.

65720287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51968.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 65720287 is about 8106.8049810021. The cubic root of 65720287 is about 403.5522909362.

The spelling of 65720287 in words is "sixty-five million, seven hundred twenty thousand, two hundred eighty-seven".