681548642 has 8 divisors (see below), whose sum is σ = 1035264000. Its totient is φ = 336460644.

The previous prime is 681548641. The next prime is 681548657. The reversal of 681548642 is 246845186.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 681548593 and 681548602.

It is not an unprimeable number, because it can be changed into a prime (681548641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2156642 + ... + 2156957.

It is an arithmetic number, because the mean of its divisors is an integer number (129408000).

Almost surely, 2^681548642 is an apocalyptic number.

681548642 is a deficient number, since it is larger than the sum of its proper divisors (353715358).

681548642 is a wasteful number, since it uses less digits than its factorization.

681548642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313680.

The product of its digits is 368640, while the sum is 44.

The square root of 681548642 is about 26106.4865885856. The cubic root of 681548642 is about 880.0329886049.

The spelling of 681548642 in words is "six hundred eighty-one million, five hundred forty-eight thousand, six hundred forty-two".