65720028 has 48 divisors (see below), whose sum is σ = 177133824. Its totient is φ = 18743040.

The previous prime is 65720027. The next prime is 65720059. The reversal of 65720028 is 82002756.

It is a junction number, because it is equal to n+sod(n) for n = 65719977 and 65720004.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 12400 + ... + 16887.

It is an arithmetic number, because the mean of its divisors is an integer number (3690288).

Almost surely, 2^65720028 is an apocalyptic number.

65720028 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

65720028 is an abundant number, since it is smaller than the sum of its proper divisors (111413796).

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

65720028 is a wasteful number, since it uses less digits than its factorization.

65720028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29322 (or 29320 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 65720028 is about 8106.7890067523. The cubic root of 65720028 is about 403.5517608098.

The spelling of 65720028 in words is "sixty-five million, seven hundred twenty thousand, twenty-eight".