681064 has 8 divisors (see below), whose sum is σ = 1277010. Its totient is φ = 340528.

The previous prime is 681061. The next prime is 681067. The reversal of 681064 is 460186.

It is an interprime number because it is at equal distance from previous prime (681061) and next prime (681067).

It can be written as a sum of positive squares in only one way, i.e., 656100 + 24964 = 810^2 + 158^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (681061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42559 + ... + 42574.

2⁶⁸¹⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

681064 is a deficient number, since it is larger than the sum of its proper divisors (595946).

681064 is a wasteful number, since it uses less digits than its factorization.

681064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85139 (or 85135 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 681064 is about 825.2660177179. The cubic root of 681064 is about 87.9824345106.

The spelling of 681064 in words is "six hundred eighty-one thousand, sixty-four".