65247220 has 12 divisors (see below), whose sum is σ = 137019204. Its totient is φ = 26098880.

The previous prime is 65247191. The next prime is 65247257. The reversal of 65247220 is 2274256.

It can be written as a sum of positive squares in 2 ways, for example, as 13003236 + 52243984 = 3606^2 + 7228^2 .

It is a super-3 number, since 3×65247220³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1631161 + ... + 1631200.

It is an arithmetic number, because the mean of its divisors is an integer number (11418267).

Almost surely, 2^65247220 is an apocalyptic number.

It is an amenable number.

65247220 is an abundant number, since it is smaller than the sum of its proper divisors (71771984).

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

65247220 is a wasteful number, since it uses less digits than its factorization.

65247220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262370 (or 3262368 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 65247220 is about 8077.5751311888. The cubic root of 65247220 is about 402.5816765179.

The spelling of 65247220 in words is "sixty-five million, two hundred forty-seven thousand, two hundred twenty".