681870650 has 24 divisors (see below), whose sum is σ = 1323424224. Its totient is φ = 260889200.

The previous prime is 681870641. The next prime is 681870659. The reversal of 681870650 is 56078186.

It is an interprime number because it is at equal distance from previous prime (681870641) and next prime (681870659).

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 681870598 and 681870607.

It is not an unprimeable number, because it can be changed into a prime (681870659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295316 + ... + 297615.

It is an arithmetic number, because the mean of its divisors is an integer number (55142676).

Almost surely, 2^681870650 is an apocalyptic number.

681870650 is a deficient number, since it is larger than the sum of its proper divisors (641553574).

681870650 is a wasteful number, since it uses less digits than its factorization.

681870650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592966 (or 592961 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 681870650 is about 26112.6530632182. The cubic root of 681870650 is about 880.1715617642.

The spelling of 681870650 in words is "six hundred eighty-one million, eight hundred seventy thousand, six hundred fifty".