681770384 has 10 divisors (see below), whose sum is σ = 1320930150. Its totient is φ = 340885184.

The previous prime is 681770381. The next prime is 681770387. The reversal of 681770384 is 483077186.

It is an interprime number because it is at equal distance from previous prime (681770381) and next prime (681770387).

It can be written as a sum of positive squares in only one way, i.e., 648822784 + 32947600 = 25472^2 + 5740^2 .

It is not an unprimeable number, because it can be changed into a prime (681770381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21305309 + ... + 21305340.

It is an arithmetic number, because the mean of its divisors is an integer number (132093015).

Almost surely, 2^681770384 is an apocalyptic number.

It is an amenable number.

681770384 is a deficient number, since it is larger than the sum of its proper divisors (639159766).

681770384 is a wasteful number, since it uses less digits than its factorization.

681770384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42610657 (or 42610651 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 681770384 is about 26110.7331187770. The cubic root of 681770384 is about 880.1284178983.

The spelling of 681770384 in words is "six hundred eighty-one million, seven hundred seventy thousand, three hundred eighty-four".