64140568 has 8 divisors (see below), whose sum is σ = 120263580. Its totient is φ = 32070280.

The previous prime is 64140539. The next prime is 64140631. The reversal of 64140568 is 86504146.

64140568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×64140568² = 8228024926725248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4008778 + ... + 4008793.

Almost surely, 2^64140568 is an apocalyptic number.

It is an amenable number.

64140568 is a deficient number, since it is larger than the sum of its proper divisors (56123012).

64140568 is a wasteful number, since it uses less digits than its factorization.

64140568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8017577 (or 8017573 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 64140568 is about 8008.7806812273. The cubic root of 64140568 is about 400.2926358584.

It can be divided in two parts, 641 and 40568, that added together give a square (41209 = 203²).

The spelling of 64140568 in words is "sixty-four million, one hundred forty thousand, five hundred sixty-eight".