8744157621 has 12 divisors (see below), whose sum is σ = 13373417772. Its totient is φ = 5486530176.

The previous prime is 8744157619. The next prime is 8744157647. The reversal of 8744157621 is 1267514478.

8744157621 is a `hidden beast` number, since 8 + 7 + 4 + 4 + 15 + 7 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6937057521 + 1807100100 = 83289^2 + 42510^2 .

It is not a de Polignac number, because 8744157621 - 2¹ = 8744157619 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8744157221) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 28575526 + ... + 28575831.

It is an arithmetic number, because the mean of its divisors is an integer number (1114451481).

Almost surely, 2^8744157621 is an apocalyptic number.

It is an amenable number.

8744157621 is a deficient number, since it is larger than the sum of its proper divisors (4629260151).

8744157621 is a wasteful number, since it uses less digits than its factorization.

8744157621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57151380 (or 57151377 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 8744157621 is about 93510.2006253863. The cubic root of 8744157621 is about 2060.1839171106.

The spelling of 8744157621 in words is "eight billion, seven hundred forty-four million, one hundred fifty-seven thousand, six hundred twenty-one".