64642016 has 24 divisors (see below), whose sum is σ = 127456560. Its totient is φ = 32272128.

The previous prime is 64642013. The next prime is 64642027. The reversal of 64642016 is 61024646.

It is a self number, because there is not a number n which added to its sum of digits gives 64642016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64642013) 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, 29900 + ... + 31988.

It is an arithmetic number, because the mean of its divisors is an integer number (5310690).

Almost surely, 2^64642016 is an apocalyptic number.

It is an amenable number.

64642016 is a deficient number, since it is larger than the sum of its proper divisors (62814544).

64642016 is a wasteful number, since it uses less digits than its factorization.

64642016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066 (or 3058 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 64642016 is about 8040.0258706051. The cubic root of 64642016 is about 401.3330856047. Note that the first 3 decimals are identical.

The spelling of 64642016 in words is "sixty-four million, six hundred forty-two thousand, sixteen".