681027637248 has 520 divisors, whose sum is σ = 2353737976128. Its totient is φ = 192180584448.

The previous prime is 681027637243. The next prime is 681027637249. The reversal of 681027637248 is 842736720186.

681027637248 is a `hidden beast` number, since 68 + 102 + 76 + 372 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 681027637194 and 681027637203.

It is not an unprimeable number, because it can be changed into a prime (681027637243) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 192760090 + ... + 192763622.

Almost surely, 2^681027637248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681027637248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1176868988064).

681027637248 is an abundant number, since it is smaller than the sum of its proper divisors (1672710338880).

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

681027637248 is an equidigital number, since it uses as much as digits as its factorization.

681027637248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659 (or 3628 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 54.

The spelling of 681027637248 in words is "six hundred eighty-one billion, twenty-seven million, six hundred thirty-seven thousand, two hundred forty-eight".