65563620 has 48 divisors (see below), whose sum is σ = 185377920. Its totient is φ = 17313888.

The previous prime is 65563607. The next prime is 65563621. The reversal of 65563620 is 2636556.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 515 × 309 × 412.

It is not an unprimeable number, because it can be changed into a prime (65563621) 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, 636489 + ... + 636591.

It is an arithmetic number, because the mean of its divisors is an integer number (3862040).

Almost surely, 2^65563620 is an apocalyptic number.

65563620 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 65563620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92688960).

65563620 is an abundant number, since it is smaller than the sum of its proper divisors (119814300).

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

65563620 is an equidigital number, since it uses as much as digits as its factorization.

65563620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 65563620 is about 8097.1365308978. The cubic root of 65563620 is about 403.2313670404.

The spelling of 65563620 in words is "sixty-five million, five hundred sixty-three thousand, six hundred twenty".