64780715 has 8 divisors (see below), whose sum is σ = 78187248. Its totient is φ = 51524320.

The previous prime is 64780687. The next prime is 64780721. The reversal of 64780715 is 51708746.

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

It is not a de Polignac number, because 64780715 - 2⁸ = 64780459 is a prime.

It is a super-2 number, since 2×64780715² = 8393082071822450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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, 36581 + ... + 38310.

It is an arithmetic number, because the mean of its divisors is an integer number (9773406).

Almost surely, 2^64780715 is an apocalyptic number.

64780715 is a deficient number, since it is larger than the sum of its proper divisors (13406533).

64780715 is a wasteful number, since it uses less digits than its factorization.

64780715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75069.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 64780715 is about 8048.6467806706. The cubic root of 64780715 is about 401.6199203723.

The spelling of 64780715 in words is "sixty-four million, seven hundred eighty thousand, seven hundred fifteen".