64213500 has 192 divisors, whose sum is σ = 209139840. Its totient is φ = 15206400.

The previous prime is 64213489. The next prime is 64213507. The reversal of 64213500 is 531246.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64213507) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 721456 + ... + 721544.

It is an arithmetic number, because the mean of its divisors is an integer number (1089270).

Almost surely, 2^64213500 is an apocalyptic number.

64213500 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 64213500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104569920).

64213500 is an abundant number, since it is smaller than the sum of its proper divisors (144926340).

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

64213500 is a wasteful number, since it uses less digits than its factorization.

64213500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 64213500 is about 8013.3326400443. The cubic root of 64213500 is about 400.4442979822. Note that the first 3 decimals are identical.

Adding to 64213500 its reverse (531246), we get a palindrome (64744746).

The spelling of 64213500 in words is "sixty-four million, two hundred thirteen thousand, five hundred".