64000072 has 8 divisors (see below), whose sum is σ = 120000150. Its totient is φ = 32000032.

The previous prime is 64000067. The next prime is 64000091. The reversal of 64000072 is 27000046.

It can be written as a sum of positive squares in only one way, i.e., 53670276 + 10329796 = 7326^2 + 3214^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

64000072 is a modest number, since divided by 72 gives 64 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3999997 + ... + 4000012.

Almost surely, 2^64000072 is an apocalyptic number.

It is an amenable number.

64000072 is a deficient number, since it is larger than the sum of its proper divisors (56000078).

64000072 is a wasteful number, since it uses less digits than its factorization.

64000072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8000015 (or 8000011 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 64000072 is about 8000.0044999987. The cubic root of 64000072 is about 400.0001499999. Note that the first 3 decimals are identical.

The spelling of 64000072 in words is "sixty-four million, seventy-two", and thus it is an aban number.