681919450 has 24 divisors (see below), whose sum is σ = 1275980832. Its totient is φ = 271131120.

The previous prime is 681919379. The next prime is 681919477. The reversal of 681919450 is 54919186.

It is a junction number, because it is equal to n+sod(n) for n = 681919397 and 681919406.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32484 + ... + 49183.

It is an arithmetic number, because the mean of its divisors is an integer number (53165868).

Almost surely, 2^681919450 is an apocalyptic number.

681919450 is a deficient number, since it is larger than the sum of its proper divisors (594061382).

681919450 is a wasteful number, since it uses less digits than its factorization.

681919450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81846 (or 81841 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 681919450 is about 26113.5874594051. The cubic root of 681919450 is about 880.1925585851.

The spelling of 681919450 in words is "six hundred eighty-one million, nine hundred nineteen thousand, four hundred fifty".