64540733 has 2 divisors, whose sum is σ = 64540734. Its totient is φ = 64540732.

The previous prime is 64540711. The next prime is 64540757. The reversal of 64540733 is 33704546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54567769 + 9972964 = 7387^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 64540733 - 2⁶ = 64540669 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64540733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64540703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32270366 + 32270367.

It is an arithmetic number, because the mean of its divisors is an integer number (32270367).

Almost surely, 2^64540733 is an apocalyptic number.

It is an amenable number.

64540733 is a deficient number, since it is larger than the sum of its proper divisors (1).

64540733 is an equidigital number, since it uses as much as digits as its factorization.

64540733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 64540733 is about 8033.7247276715. The cubic root of 64540733 is about 401.1233692338.

The spelling of 64540733 in words is "sixty-four million, five hundred forty thousand, seven hundred thirty-three".