64213340 has 12 divisors (see below), whose sum is σ = 134848056. Its totient is φ = 25685328.

The previous prime is 64213313. The next prime is 64213343. The reversal of 64213340 is 4331246.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64213343) 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, 1605314 + ... + 1605353.

It is an arithmetic number, because the mean of its divisors is an integer number (11237338).

Almost surely, 2^64213340 is an apocalyptic number.

It is an amenable number.

64213340 is an abundant number, since it is smaller than the sum of its proper divisors (70634716).

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

64213340 is a wasteful number, since it uses less digits than its factorization.

64213340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210676 (or 3210674 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 64213340 is about 8013.3226566762. The cubic root of 64213340 is about 400.4439653879.

Adding to 64213340 its reverse (4331246), we get a palindrome (68544586).

The spelling of 64213340 in words is "sixty-four million, two hundred thirteen thousand, three hundred forty".