8464081621 has 16 divisors (see below), whose sum is σ = 9030647808. Its totient is φ = 7920068400.

The previous prime is 8464081573. The next prime is 8464081643. The reversal of 8464081621 is 1261804648.

It is a cyclic number.

It is not a de Polignac number, because 8464081621 - 2¹⁷ = 8463950549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8464081651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85936 + ... + 155926.

It is an arithmetic number, because the mean of its divisors is an integer number (564415488).

Almost surely, 2^8464081621 is an apocalyptic number.

It is an amenable number.

8464081621 is a deficient number, since it is larger than the sum of its proper divisors (566566187).

8464081621 is a wasteful number, since it uses less digits than its factorization.

8464081621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70152.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 8464081621 is about 92000.4435913219. The cubic root of 8464081621 is about 2037.9488563393.

The spelling of 8464081621 in words is "eight billion, four hundred sixty-four million, eighty-one thousand, six hundred twenty-one".