720678578 has 8 divisors (see below), whose sum is σ = 1084428972. Its totient is φ = 359202256.

The previous prime is 720678559. The next prime is 720678617. The reversal of 720678578 is 875876027.

It can be written as a sum of positive squares in 2 ways, for example, as 713263849 + 7414729 = 26707^2 + 2723^2 .

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

It is a super-2 number, since 2×720678578² = 1038755225576204168, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 567725 + ... + 568992.

Almost surely, 2^720678578 is an apocalyptic number.

720678578 is a deficient number, since it is larger than the sum of its proper divisors (363750394).

720678578 is a wasteful number, since it uses less digits than its factorization.

720678578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137036.

The product of its (nonzero) digits is 1317120, while the sum is 50.

The square root of 720678578 is about 26845.4573065910. The cubic root of 720678578 is about 896.5624333694.

The spelling of 720678578 in words is "seven hundred twenty million, six hundred seventy-eight thousand, five hundred seventy-eight".