65720770 has 16 divisors (see below), whose sum is σ = 121049280. Its totient is φ = 25676784.

The previous prime is 65720747. The next prime is 65720773. The reversal of 65720770 is 7702756.

It is not an unprimeable number, because it can be changed into a prime (65720773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75990 + ... + 76849.

It is an arithmetic number, because the mean of its divisors is an integer number (7565580).

Almost surely, 2^65720770 is an apocalyptic number.

65720770 is a deficient number, since it is larger than the sum of its proper divisors (55328510).

65720770 is a wasteful number, since it uses less digits than its factorization.

65720770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152889.

The product of its (nonzero) digits is 20580, while the sum is 34.

The square root of 65720770 is about 8106.8347707351. The cubic root of 65720770 is about 403.5532795466.

The spelling of 65720770 in words is "sixty-five million, seven hundred twenty thousand, seven hundred seventy".