861624700000 has 72 divisors (see below), whose sum is σ = 2120269075344. Its totient is φ = 344649840000.

The previous prime is 861624699997. The next prime is 861624700009. The reversal of 861624700000 is 7426168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861624700009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4208124 + ... + 4408123.

It is an arithmetic number, because the mean of its divisors is an integer number (29448181602).

Almost surely, 2^861624700000 is an apocalyptic number.

861624700000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

861624700000 is an abundant number, since it is smaller than the sum of its proper divisors (1258644375344).

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

861624700000 is an frugal number, since it uses more digits than its factorization.

861624700000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8616282 (or 8616254 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 861624700000 in words is "eight hundred sixty-one billion, six hundred twenty-four million, seven hundred thousand".