64643016 has 32 divisors (see below), whose sum is σ = 170114400. Its totient is φ = 20413440.

The previous prime is 64643011. The next prime is 64643021. The reversal of 64643016 is 61034646.

It is an interprime number because it is at equal distance from previous prime (64643011) and next prime (64643021).

It is not an unprimeable number, because it can be changed into a prime (64643011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70425 + ... + 71336.

It is an arithmetic number, because the mean of its divisors is an integer number (5316075).

Almost surely, 2^64643016 is an apocalyptic number.

It is an amenable number.

64643016 is an abundant number, since it is smaller than the sum of its proper divisors (105471384).

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

64643016 is a wasteful number, since it uses less digits than its factorization.

64643016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141789 (or 141785 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 64643016 is about 8040.0880592193. The cubic root of 64643016 is about 401.3351551102.

The spelling of 64643016 in words is "sixty-four million, six hundred forty-three thousand, sixteen".