64449868 has 48 divisors (see below), whose sum is σ = 136378368. Its totient is φ = 26064000.

The previous prime is 64449863. The next prime is 64449877. The reversal of 64449868 is 86894446.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (64449863) 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, 34683 + ... + 36493.

It is an arithmetic number, because the mean of its divisors is an integer number (2841216).

Almost surely, 2^64449868 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 64449868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68189184).

64449868 is an abundant number, since it is smaller than the sum of its proper divisors (71928500).

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

64449868 is a wasteful number, since it uses less digits than its factorization.

64449868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894 (or 1892 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 49.

The square root of 64449868 is about 8028.0675134182. The cubic root of 64449868 is about 400.9350375588.

The spelling of 64449868 in words is "sixty-four million, four hundred forty-nine thousand, eight hundred sixty-eight".