65251620 has 72 divisors (see below), whose sum is σ = 226209984. Its totient is φ = 14914368.

The previous prime is 65251607. The next prime is 65251673. The reversal of 65251620 is 2615256.

65251620 is a `hidden beast` number, since 652 + 5 + 1 + 6 + 2 + 0 = 666.

65251620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24634 + ... + 27153.

Almost surely, 2^65251620 is an apocalyptic number.

65251620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65251620 is an abundant number, since it is smaller than the sum of its proper divisors (160958364).

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

65251620 is a wasteful number, since it uses less digits than its factorization.

65251620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51809 (or 51804 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 65251620 is about 8077.8474855620. The cubic root of 65251620 is about 402.5907257901.

Adding to 65251620 its reverse (2615256), we get a palindrome (67866876).

The spelling of 65251620 in words is "sixty-five million, two hundred fifty-one thousand, six hundred twenty".