64728337 has 4 divisors (see below), whose sum is σ = 64792756. Its totient is φ = 64663920.

The previous prime is 64728331. The next prime is 64728347. The reversal of 64728337 is 73382746.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73382746 = 2 ⋅36691373.

It can be written as a sum of positive squares in 2 ways, for example, as 30902481 + 33825856 = 5559^2 + 5816^2 .

It is a cyclic number.

It is not a de Polignac number, because 64728337 - 2¹⁵ = 64695569 is a prime.

It is a super-2 number, since 2×64728337² = 8379515221571138, which contains 22 as substring.

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 64728337.

It is not an unprimeable number, because it can be changed into a prime (64728331) 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, 30678 + ... + 32719.

It is an arithmetic number, because the mean of its divisors is an integer number (16198189).

Almost surely, 2^64728337 is an apocalyptic number.

It is an amenable number.

64728337 is a deficient number, since it is larger than the sum of its proper divisors (64419).

64728337 is a wasteful number, since it uses less digits than its factorization.

64728337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64418.

The product of its digits is 169344, while the sum is 40.

The square root of 64728337 is about 8045.3922837858. The cubic root of 64728337 is about 401.5116488481.

The spelling of 64728337 in words is "sixty-four million, seven hundred twenty-eight thousand, three hundred thirty-seven".