65728751 has 4 divisors (see below), whose sum is σ = 71704104. Its totient is φ = 59753400.

The previous prime is 65728739. The next prime is 65728753. The reversal of 65728751 is 15782756.

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-65728751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65728699 and 65728708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65728753) 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, 2987660 + ... + 2987681.

It is an arithmetic number, because the mean of its divisors is an integer number (17926026).

Almost surely, 2^65728751 is an apocalyptic number.

65728751 is a deficient number, since it is larger than the sum of its proper divisors (5975353).

65728751 is a wasteful number, since it uses less digits than its factorization.

65728751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5975352.

The product of its digits is 117600, while the sum is 41.

The square root of 65728751 is about 8107.3269947622. The cubic root of 65728751 is about 403.5696144554.

The spelling of 65728751 in words is "sixty-five million, seven hundred twenty-eight thousand, seven hundred fifty-one".