8415991620 has 72 divisors (see below), whose sum is σ = 25536190680. Its totient is φ = 2243589120.

The previous prime is 8415991609. The next prime is 8415991637. The reversal of 8415991620 is 261995148.

8415991620 is a `hidden beast` number, since 8 + 4 + 15 + 9 + 9 + 1 + 620 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1682804484 + 6733187136 = 41022^2 + 82056^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 964236 + ... + 972924.

It is an arithmetic number, because the mean of its divisors is an integer number (354669315).

Almost surely, 2^8415991620 is an apocalyptic number.

It is an amenable number.

8415991620 is an abundant number, since it is smaller than the sum of its proper divisors (17120199060).

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

8415991620 is a wasteful number, since it uses less digits than its factorization.

8415991620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14085 (or 14080 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 8415991620 is about 91738.7138562559. The cubic root of 8415991620 is about 2034.0818819408.

The spelling of 8415991620 in words is "eight billion, four hundred fifteen million, nine hundred ninety-one thousand, six hundred twenty".