868000621 has 4 divisors (see below), whose sum is σ = 868059612. Its totient is φ = 867941632.

The previous prime is 868000613. The next prime is 868000643. The reversal of 868000621 is 126000868.

868000621 = T₂₄₀₅₄ + T₂₄₀₅₅ + T₂₄₀₅₆.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 103754596 + 764246025 = 10186^2 + 27645^2 .

It is a cyclic number.

It is not a de Polignac number, because 868000621 - 2³ = 868000613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868001621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12651 + ... + 43543.

It is an arithmetic number, because the mean of its divisors is an integer number (217014903).

Almost surely, 2^868000621 is an apocalyptic number.

868000621 is the 24056-th centered triangular number.

It is an amenable number.

868000621 is a deficient number, since it is larger than the sum of its proper divisors (58991).

868000621 is a wasteful number, since it uses less digits than its factorization.

868000621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58990.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 868000621 is about 29461.8502643673. The cubic root of 868000621 is about 953.9084120388.

The spelling of 868000621 in words is "eight hundred sixty-eight million, six hundred twenty-one", and thus it is an aban number.