866207631 has 8 divisors (see below), whose sum is σ = 1165539760. Its totient is φ = 572173632.

The previous prime is 866207627. The next prime is 866207633. The reversal of 866207631 is 136702668.

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

It is not a de Polignac number, because 866207631 - 2² = 866207627 is a prime.

It is a super-2 number, since 2×866207631² = 1500631320005264322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866207631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866207633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1324150 + ... + 1324803.

It is an arithmetic number, because the mean of its divisors is an integer number (145692470).

Almost surely, 2^866207631 is an apocalyptic number.

866207631 is a deficient number, since it is larger than the sum of its proper divisors (299332129).

866207631 is a wasteful number, since it uses less digits than its factorization.

866207631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649065.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 866207631 is about 29431.4055219930. The cubic root of 866207631 is about 953.2511439759.

The spelling of 866207631 in words is "eight hundred sixty-six million, two hundred seven thousand, six hundred thirty-one".