64730639 has 8 divisors (see below), whose sum is σ = 67264560. Its totient is φ = 62216896.

The previous prime is 64730563. The next prime is 64730657. The reversal of 64730639 is 93603746.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64730639 - 2¹⁶ = 64665103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64730689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1667 + ... + 11499.

It is an arithmetic number, because the mean of its divisors is an integer number (8408070).

Almost surely, 2^64730639 is an apocalyptic number.

64730639 is a deficient number, since it is larger than the sum of its proper divisors (2533921).

64730639 is a wasteful number, since it uses less digits than its factorization.

64730639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10089.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 64730639 is about 8045.5353457679. The cubic root of 64730639 is about 401.5164085813.

The spelling of 64730639 in words is "sixty-four million, seven hundred thirty thousand, six hundred thirty-nine".