65567220 has 48 divisors (see below), whose sum is σ = 184829568. Its totient is φ = 17366400.

The previous prime is 65567191. The next prime is 65567221. The reversal of 65567220 is 2276556.

Added to its reverse (2276556) it gives a triangular number (67843776 = T₁₁₆₄₈).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65567221) 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, 5442 + ... + 12678.

It is an arithmetic number, because the mean of its divisors is an integer number (3850616).

Almost surely, 2^65567220 is an apocalyptic number.

65567220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65567220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92414784).

65567220 is an abundant number, since it is smaller than the sum of its proper divisors (119262348).

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

65567220 is a wasteful number, since it uses less digits than its factorization.

65567220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7400 (or 7398 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 65567220 is about 8097.3588286552. The cubic root of 65567220 is about 403.2387471818.

Adding to 65567220 its reverse (2276556), we get a triangular number (67843776 = T₁₁₆₄₈).

The spelling of 65567220 in words is "sixty-five million, five hundred sixty-seven thousand, two hundred twenty".