681437428 has 12 divisors (see below), whose sum is σ = 1362874912. Its totient is φ = 292044600.

The previous prime is 681437417. The next prime is 681437431. The reversal of 681437428 is 824734186.

681437428 is an admirable number.

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, 12168498 + ... + 12168553.

Almost surely, 2^681437428 is an apocalyptic number.

It is an amenable number.

681437428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

681437428 is a wasteful number, since it uses less digits than its factorization.

681437428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24337062 (or 24337060 counting only the distinct ones).

The product of its digits is 258048, while the sum is 43.

The square root of 681437428 is about 26104.3564946543. The cubic root of 681437428 is about 879.9851185500.

The spelling of 681437428 in words is "six hundred eighty-one million, four hundred thirty-seven thousand, four hundred twenty-eight".