65220570 has 48 divisors (see below), whose sum is σ = 171636192. Its totient is φ = 17180640.

The previous prime is 65220563. The next prime is 65220599. The reversal of 65220570 is 7502256.

65220570 is a `hidden beast` number, since 652 + 2 + 0 + 5 + 7 + 0 = 666.

It is a super-2 number, since 2×65220570² = 8507445502249800, which contains 22 as substring.

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 3105 + ... + 11835.

It is an arithmetic number, because the mean of its divisors is an integer number (3575754).

Almost surely, 2^65220570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65220570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85818096).

65220570 is an abundant number, since it is smaller than the sum of its proper divisors (106415622).

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

65220570 is a wasteful number, since it uses less digits than its factorization.

65220570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8827 (or 8824 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 65220570 is about 8075.9253339788. The cubic root of 65220570 is about 402.5268580254.

The spelling of 65220570 in words is "sixty-five million, two hundred twenty thousand, five hundred seventy".