681624745 has 16 divisors (see below), whose sum is σ = 853839360. Its totient is φ = 521769600.

The previous prime is 681624743. The next prime is 681624793. The reversal of 681624745 is 547426186.

It is not a de Polignac number, because 681624745 - 2¹ = 681624743 is a prime.

It is a super-2 number, since 2×681624745² = 929224585992630050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681624743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10911 + ... + 38500.

It is an arithmetic number, because the mean of its divisors is an integer number (53364960).

Almost surely, 2^681624745 is an apocalyptic number.

It is an amenable number.

681624745 is a deficient number, since it is larger than the sum of its proper divisors (172214615).

681624745 is a wasteful number, since it uses less digits than its factorization.

681624745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49536.

The product of its digits is 322560, while the sum is 43.

The square root of 681624745 is about 26107.9440975348. The cubic root of 681624745 is about 880.0657427640.

The spelling of 681624745 in words is "six hundred eighty-one million, six hundred twenty-four thousand, seven hundred forty-five".