65787220 has 12 divisors (see below), whose sum is σ = 138153204. Its totient is φ = 26314880.

The previous prime is 65787217. The next prime is 65787269. The reversal of 65787220 is 2278756.

It can be written as a sum of positive squares in 2 ways, for example, as 39388176 + 26399044 = 6276^2 + 5138^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 65787220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1644661 + ... + 1644700.

It is an arithmetic number, because the mean of its divisors is an integer number (11512767).

Almost surely, 2^65787220 is an apocalyptic number.

It is an amenable number.

65787220 is an abundant number, since it is smaller than the sum of its proper divisors (72365984).

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

65787220 is a wasteful number, since it uses less digits than its factorization.

65787220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289370 (or 3289368 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 65787220 is about 8110.9321289233. The cubic root of 65787220 is about 403.6892440857.

The spelling of 65787220 in words is "sixty-five million, seven hundred eighty-seven thousand, two hundred twenty".