681242730 has 32 divisors (see below), whose sum is σ = 1868552064. Its totient is φ = 155712576.

The previous prime is 681242729. The next prime is 681242767. The reversal of 681242730 is 37242186.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 681242691 and 681242700.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1621797 + ... + 1622216.

It is an arithmetic number, because the mean of its divisors is an integer number (58392252).

Almost surely, 2^681242730 is an apocalyptic number.

681242730 is an abundant number, since it is smaller than the sum of its proper divisors (1187309334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681242730 is a wasteful number, since it uses less digits than its factorization.

681242730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244030.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 681242730 is about 26100.6270039630. The cubic root of 681242730 is about 879.9013017751.

The spelling of 681242730 in words is "six hundred eighty-one million, two hundred forty-two thousand, seven hundred thirty".