678730715 has 16 divisors (see below), whose sum is σ = 877685088. Its totient is φ = 500898816.

The previous prime is 678730699. The next prime is 678730739. The reversal of 678730715 is 517037876.

It is a cyclic number.

It is not a de Polignac number, because 678730715 - 2⁴ = 678730699 is a prime.

It is a super-2 number, since 2×678730715² = 921350766968822450, 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 15 ways as a sum of consecutive naturals, for example, 166532 + ... + 170558.

It is an arithmetic number, because the mean of its divisors is an integer number (54855318).

Almost surely, 2^678730715 is an apocalyptic number.

678730715 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

678730715 is a deficient number, since it is larger than the sum of its proper divisors (198954373).

678730715 is a wasteful number, since it uses less digits than its factorization.

678730715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6638.

The product of its (nonzero) digits is 246960, while the sum is 44.

The square root of 678730715 is about 26052.4608242676. The cubic root of 678730715 is about 878.8184534571.

The spelling of 678730715 in words is "six hundred seventy-eight million, seven hundred thirty thousand, seven hundred fifteen".