64399073 has 4 divisors (see below), whose sum is σ = 64468740. Its totient is φ = 64329408.

The previous prime is 64399063. The next prime is 64399087. The reversal of 64399073 is 37099346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18809569 + 45589504 = 4337^2 + 6752^2 .

It is a cyclic number.

It is not a de Polignac number, because 64399073 - 2¹² = 64394977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64399073.

It is not an unprimeable number, because it can be changed into a prime (64399003) 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, 33428 + ... + 35301.

It is an arithmetic number, because the mean of its divisors is an integer number (16117185).

Almost surely, 2^64399073 is an apocalyptic number.

It is an amenable number.

64399073 is a deficient number, since it is larger than the sum of its proper divisors (69667).

64399073 is an equidigital number, since it uses as much as digits as its factorization.

64399073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69666.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 64399073 is about 8024.9033015981. The cubic root of 64399073 is about 400.8296799714.

The spelling of 64399073 in words is "sixty-four million, three hundred ninety-nine thousand, seventy-three".