64390016 has 64 divisors (see below), whose sum is σ = 137479680. Its totient is φ = 29933568.

The previous prime is 64390013. The next prime is 64390019. The reversal of 64390016 is 61009346.

It is an interprime number because it is at equal distance from previous prime (64390013) and next prime (64390019).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64390013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276236 + ... + 276468.

It is an arithmetic number, because the mean of its divisors is an integer number (2148120).

Almost surely, 2^64390016 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 64390016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68739840).

64390016 is an abundant number, since it is smaller than the sum of its proper divisors (73089664).

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

64390016 is a wasteful number, since it uses less digits than its factorization.

64390016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 64390016 is about 8024.3389758908. The cubic root of 64390016 is about 400.8108883726.

The spelling of 64390016 in words is "sixty-four million, three hundred ninety thousand, sixteen".