65720115 has 12 divisors (see below), whose sum is σ = 113914944. Its totient is φ = 35050704.

The previous prime is 65720071. The next prime is 65720117. The reversal of 65720115 is 51102756.

65720115 is a `hidden beast` number, since 657 + 2 + 0 + 1 + 1 + 5 = 666.

It is not a de Polignac number, because 65720115 - 2¹⁴ = 65703731 is a prime.

It is a super-2 number, since 2×65720115² = 8638267031226450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65720117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 730179 + ... + 730268.

It is an arithmetic number, because the mean of its divisors is an integer number (9492912).

Almost surely, 2^65720115 is an apocalyptic number.

65720115 is a deficient number, since it is larger than the sum of its proper divisors (48194829).

65720115 is a wasteful number, since it uses less digits than its factorization.

65720115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460458 (or 1460455 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 65720115 is about 8106.7943726235. The cubic root of 65720115 is about 403.5519388833.

The spelling of 65720115 in words is "sixty-five million, seven hundred twenty thousand, one hundred fifteen".