65123220 has 48 divisors (see below), whose sum is σ = 185794560. Its totient is φ = 17037696.

The previous prime is 65123171. The next prime is 65123221. The reversal of 65123220 is 2232156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65123221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7060 + ... + 13419.

It is an arithmetic number, because the mean of its divisors is an integer number (3870720).

Almost surely, 2^65123220 is an apocalyptic number.

65123220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65123220 is an abundant number, since it is smaller than the sum of its proper divisors (120671340).

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

65123220 is a wasteful number, since it uses less digits than its factorization.

65123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20544 (or 20542 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 65123220 is about 8069.8959101094. The cubic root of 65123220 is about 402.3264841122.

Adding to 65123220 its reverse (2232156), we get a palindrome (67355376).

It can be divided in two parts, 651 and 23220, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 65123220 in words is "sixty-five million, one hundred twenty-three thousand, two hundred twenty".