867820631 has 4 divisors (see below), whose sum is σ = 871047000. Its totient is φ = 864594264.

The previous prime is 867820589. The next prime is 867820651. The reversal of 867820631 is 136028768.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 867820631 - 2¹⁰ = 867819607 is a prime.

It is a super-2 number, since 2×867820631² = 1506225295178476322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867820651) 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, 1612781 + ... + 1613318.

It is an arithmetic number, because the mean of its divisors is an integer number (217761750).

Almost surely, 2^867820631 is an apocalyptic number.

867820631 is a deficient number, since it is larger than the sum of its proper divisors (3226369).

867820631 is a wasteful number, since it uses less digits than its factorization.

867820631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3226368.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 867820631 is about 29458.7954777516. The cubic root of 867820631 is about 953.8424728217.

The spelling of 867820631 in words is "eight hundred sixty-seven million, eight hundred twenty thousand, six hundred thirty-one".