65720025 has 72 divisors (see below), whose sum is σ = 140511840. Its totient is φ = 30028320.

The previous prime is 65719991. The next prime is 65720027. The reversal of 65720025 is 52002756.

65720025 is a `hidden beast` number, since 657 + 2 + 0 + 0 + 2 + 5 = 666.

It is not a de Polignac number, because 65720025 - 2⁶ = 65719961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (65720027) 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 71 ways as a sum of consecutive naturals, for example, 32082 + ... + 34068.

Almost surely, 2^65720025 is an apocalyptic number.

It is an amenable number.

65720025 is an abundant number, since it is smaller than the sum of its proper divisors (74791815).

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

65720025 is a wasteful number, since it uses less digits than its factorization.

65720025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020 (or 2002 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 65720025 is about 8106.7888217222. The cubic root of 65720025 is about 403.5517546693.

The spelling of 65720025 in words is "sixty-five million, seven hundred twenty thousand, twenty-five".