8621561394 has 48 divisors (see below), whose sum is σ = 18895054464. Its totient is φ = 2840868000.

The previous prime is 8621561369. The next prime is 8621561411. The reversal of 8621561394 is 4931651268.

8621561394 is a `hidden beast` number, since 8 + 6 + 21 + 5 + 613 + 9 + 4 = 666.

It is a super-2 number, since 2×8621561394² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1252807 + ... + 1259669.

It is an arithmetic number, because the mean of its divisors is an integer number (393646968).

Almost surely, 2^8621561394 is an apocalyptic number.

8621561394 is an abundant number, since it is smaller than the sum of its proper divisors (10273493070).

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

8621561394 is a wasteful number, since it uses less digits than its factorization.

8621561394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7663 (or 7660 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 8621561394 is about 92852.3634271094. The cubic root of 8621561394 is about 2050.5103939544.

The spelling of 8621561394 in words is "eight billion, six hundred twenty-one million, five hundred sixty-one thousand, three hundred ninety-four".