861530408088 has 64 divisors (see below), whose sum is σ = 2528042914560. Its totient is φ = 239498798976.

The previous prime is 861530408071. The next prime is 861530408177. The reversal of 861530408088 is 880804035168.

It is a self number, because there is not a number n which added to its sum of digits gives 861530408088.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69293206 + ... + 69305637.

It is an arithmetic number, because the mean of its divisors is an integer number (39500670540).

Almost surely, 2^861530408088 is an apocalyptic number.

It is an amenable number.

861530408088 is an abundant number, since it is smaller than the sum of its proper divisors (1666512506472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861530408088 is a wasteful number, since it uses less digits than its factorization.

861530408088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138598896 (or 138598892 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 51.

The spelling of 861530408088 in words is "eight hundred sixty-one billion, five hundred thirty million, four hundred eight thousand, eighty-eight".