64642064 has 10 divisors (see below), whose sum is σ = 125244030. Its totient is φ = 32321024.

The previous prime is 64642057. The next prime is 64642133. The reversal of 64642064 is 46024646.

It can be written as a sum of positive squares in only one way, i.e., 43665664 + 20976400 = 6608^2 + 4580^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64642064.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2020049 + ... + 2020080.

It is an arithmetic number, because the mean of its divisors is an integer number (12524403).

Almost surely, 2^64642064 is an apocalyptic number.

It is an amenable number.

64642064 is a deficient number, since it is larger than the sum of its proper divisors (60601966).

64642064 is a wasteful number, since it uses less digits than its factorization.

64642064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040137 (or 4040131 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 64642064 is about 8040.0288556696. The cubic root of 64642064 is about 401.3331849415. Note that the first 3 decimals are identical.

The spelling of 64642064 in words is "sixty-four million, six hundred forty-two thousand, sixty-four".