8491401620 has 36 divisors (see below), whose sum is σ = 19309153500. Its totient is φ = 3135285504.

The previous prime is 8491401563. The next prime is 8491401629. The reversal of 8491401620 is 261041948.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 970696336 + 7520705284 = 31156^2 + 86722^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8491401629) 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, 1252745 + ... + 1259504.

It is an arithmetic number, because the mean of its divisors is an integer number (536365375).

Almost surely, 2^8491401620 is an apocalyptic number.

It is an amenable number.

8491401620 is an abundant number, since it is smaller than the sum of its proper divisors (10817751880).

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

8491401620 is a wasteful number, since it uses less digits than its factorization.

8491401620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512284 (or 2512269 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 8491401620 is about 92148.8015114684. The cubic root of 8491401620 is about 2040.1391693471.

The spelling of 8491401620 in words is "eight billion, four hundred ninety-one million, four hundred one thousand, six hundred twenty".