868690 has 8 divisors (see below), whose sum is σ = 1563660. Its totient is φ = 347472.

The previous prime is 868669. The next prime is 868691. The reversal of 868690 is 96868.

It can be written as a sum of positive squares in 2 ways, for example, as 848241 + 20449 = 921^2 + 143^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×868690² = 1509244632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (868691) by changing a digit.

868690 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43425 + ... + 43444.

2⁸⁶⁸⁶⁹⁰ is an apocalyptic number.

868690 is a deficient number, since it is larger than the sum of its proper divisors (694970).

868690 is a wasteful number, since it uses less digits than its factorization.

868690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86876.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 868690 is about 932.0354070528. The cubic root of 868690 is about 95.4160881294.

The spelling of 868690 in words is "eight hundred sixty-eight thousand, six hundred ninety".