861322508 has 12 divisors (see below), whose sum is σ = 1542368520. Its totient is φ = 420645792.

The previous prime is 861322489. The next prime is 861322529. The reversal of 861322508 is 805223168.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2503673 + ... + 2504016.

It is an arithmetic number, because the mean of its divisors is an integer number (128530710).

Almost surely, 2^861322508 is an apocalyptic number.

It is an amenable number.

861322508 is a deficient number, since it is larger than the sum of its proper divisors (681046012).

861322508 is a wasteful number, since it uses less digits than its factorization.

861322508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5007736 (or 5007734 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 861322508 is about 29348.2965093376. The cubic root of 861322508 is about 951.4557581180.

The spelling of 861322508 in words is "eight hundred sixty-one million, three hundred twenty-two thousand, five hundred eight".