681620528 has 10 divisors (see below), whose sum is σ = 1320639804. Its totient is φ = 340810256.

The previous prime is 681620447. The next prime is 681620539. The reversal of 681620528 is 825026186.

It is a junction number, because it is equal to n+sod(n) for n = 681620491 and 681620500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21300626 + ... + 21300657.

Almost surely, 2^681620528 is an apocalyptic number.

It is an amenable number.

681620528 is a deficient number, since it is larger than the sum of its proper divisors (639019276).

681620528 is a wasteful number, since it uses less digits than its factorization.

681620528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42601291 (or 42601285 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 681620528 is about 26107.8633365505. The cubic root of 681620528 is about 880.0639278627.

The spelling of 681620528 in words is "six hundred eighty-one million, six hundred twenty thousand, five hundred twenty-eight".