65191220 has 12 divisors (see below), whose sum is σ = 136901604. Its totient is φ = 26076480.

The previous prime is 65191213. The next prime is 65191229. The reversal of 65191220 is 2219156.

It can be written as a sum of positive squares in 2 ways, for example, as 25928464 + 39262756 = 5092^2 + 6266^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 65191220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65191229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1629761 + ... + 1629800.

It is an arithmetic number, because the mean of its divisors is an integer number (11408467).

Almost surely, 2^65191220 is an apocalyptic number.

It is an amenable number.

65191220 is an abundant number, since it is smaller than the sum of its proper divisors (71710384).

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

65191220 is a wasteful number, since it uses less digits than its factorization.

65191220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3259570 (or 3259568 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 65191220 is about 8074.1080002685. The cubic root of 65191220 is about 402.4664684076.

The spelling of 65191220 in words is "sixty-five million, one hundred ninety-one thousand, two hundred twenty".