8021687620 has 24 divisors (see below), whose sum is σ = 16847609688. Its totient is φ = 3208281600.

The previous prime is 8021687599. The next prime is 8021687623. The reversal of 8021687620 is 267861208.

It can be written as a sum of positive squares in 4 ways, for example, as 2309955844 + 5711731776 = 48062^2 + 75576^2 .

It is a super-2 number, since 2×8021687620² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (8021687623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186990 + ... + 225850.

It is an arithmetic number, because the mean of its divisors is an integer number (701983737).

Almost surely, 2^8021687620 is an apocalyptic number.

It is an amenable number.

8021687620 is an abundant number, since it is smaller than the sum of its proper divisors (8825922068).

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

8021687620 is a wasteful number, since it uses less digits than its factorization.

8021687620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49191 (or 49189 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 8021687620 is about 89563.8745253911. The cubic root of 8021687620 is about 2001.8056709523.

The spelling of 8021687620 in words is "eight billion, twenty-one million, six hundred eighty-seven thousand, six hundred twenty".