65523780 has 432 divisors, whose sum is σ = 268894080. Its totient is φ = 12773376.

The previous prime is 65523779. The next prime is 65523811. The reversal of 65523780 is 8732556.

65523780 is a `hidden beast` number, since 65 + 523 + 78 + 0 = 666.

65523780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2848849 + ... + 2848871.

It is an arithmetic number, because the mean of its divisors is an integer number (622440).

Almost surely, 2^65523780 is an apocalyptic number.

65523780 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 65523780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134447040).

65523780 is an abundant number, since it is smaller than the sum of its proper divisors (203370300).

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

65523780 is a wasteful number, since it uses less digits than its factorization.

65523780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 65523780 is about 8094.6760281064. The cubic root of 65523780 is about 403.1496754321.

The spelling of 65523780 in words is "sixty-five million, five hundred twenty-three thousand, seven hundred eighty".