64782713 has 4 divisors (see below), whose sum is σ = 65424228. Its totient is φ = 64141200.

The previous prime is 64782709. The next prime is 64782719. The reversal of 64782713 is 31728746.

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 37356544 + 27426169 = 6112^2 + 5237^2 .

It is a cyclic number.

It is not a de Polignac number, because 64782713 - 2² = 64782709 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64782719) 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, 320606 + ... + 320807.

It is an arithmetic number, because the mean of its divisors is an integer number (16356057).

Almost surely, 2^64782713 is an apocalyptic number.

It is an amenable number.

64782713 is a deficient number, since it is larger than the sum of its proper divisors (641515).

64782713 is a wasteful number, since it uses less digits than its factorization.

64782713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641514.

The product of its digits is 56448, while the sum is 38.

The square root of 64782713 is about 8048.7708999573. The cubic root of 64782713 is about 401.6240493189.

The spelling of 64782713 in words is "sixty-four million, seven hundred eighty-two thousand, seven hundred thirteen".