681652 has 6 divisors (see below), whose sum is σ = 1192898. Its totient is φ = 340824.

The previous prime is 681647. The next prime is 681673. The reversal of 681652 is 256186.

681652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 456976 + 224676 = 676^2 + 474^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 681652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85203 + ... + 85210.

2⁶⁸¹⁶⁵² is an apocalyptic number.

It is an amenable number.

681652 is a deficient number, since it is larger than the sum of its proper divisors (511246).

681652 is a wasteful number, since it uses less digits than its factorization.

681652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170417 (or 170415 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 681652 is about 825.6221896243. The cubic root of 681652 is about 88.0077472518.

The spelling of 681652 in words is "six hundred eighty-one thousand, six hundred fifty-two".