65213500 has 96 divisors (see below), whose sum is σ = 158505984. Its totient is φ = 23240000.

The previous prime is 65213497. The next prime is 65213509. The reversal of 65213500 is 531256.

It is a happy number.

65213500 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 (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65213509) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 390417 + ... + 390583.

It is an arithmetic number, because the mean of its divisors is an integer number (1651104).

Almost surely, 2^65213500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65213500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79252992).

65213500 is an abundant number, since it is smaller than the sum of its proper divisors (93292484).

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

65213500 is a wasteful number, since it uses less digits than its factorization.

65213500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 65213500 is about 8075.4876013774. The cubic root of 65213500 is about 402.5123126771.

Adding to 65213500 its reverse (531256), we get a palindrome (65744756).

The spelling of 65213500 in words is "sixty-five million, two hundred thirteen thousand, five hundred".