64139305 has 8 divisors (see below), whose sum is σ = 77022792. Its totient is φ = 51274368.

The previous prime is 64139287. The next prime is 64139323. The reversal of 64139305 is 50393146.

It is an interprime number because it is at equal distance from previous prime (64139287) and next prime (64139323).

It can be written as a sum of positive squares in 4 ways, for example, as 522729 + 63616576 = 723^2 + 7976^2 .

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 64139305 - 2⁷ = 64139177 is a prime.

It is a super-2 number, since 2×64139305² = 8227700891766050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4677 + ... + 12253.

It is an arithmetic number, because the mean of its divisors is an integer number (9627849).

Almost surely, 2^64139305 is an apocalyptic number.

It is an amenable number.

64139305 is a deficient number, since it is larger than the sum of its proper divisors (12883487).

64139305 is a wasteful number, since it uses less digits than its factorization.

64139305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9275.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 64139305 is about 8008.7018298848. The cubic root of 64139305 is about 400.2900084370.

The spelling of 64139305 in words is "sixty-four million, one hundred thirty-nine thousand, three hundred five".