681728078 has 8 divisors (see below), whose sum is σ = 1022860440. Its totient is φ = 340774600.

The previous prime is 681728059. The next prime is 681728111. The reversal of 681728078 is 870827186.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34748 + ... + 50703.

It is an arithmetic number, because the mean of its divisors is an integer number (127857555).

Almost surely, 2^681728078 is an apocalyptic number.

681728078 is a deficient number, since it is larger than the sum of its proper divisors (341132362).

681728078 is a wasteful number, since it uses less digits than its factorization.

681728078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89442.

The product of its (nonzero) digits is 301056, while the sum is 47.

The square root of 681728078 is about 26109.9229795877. The cubic root of 681728078 is about 880.1102126081.

The spelling of 681728078 in words is "six hundred eighty-one million, seven hundred twenty-eight thousand, seventy-eight".