8121622780 has 24 divisors (see below), whose sum is σ = 17081795808. Its totient is φ = 3243622848.

The previous prime is 8121622741. The next prime is 8121622787. The reversal of 8121622780 is 872261218.

It is a super-2 number, since 2×8121622780² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121622787) 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, 300879 + ... + 326758.

It is an arithmetic number, because the mean of its divisors is an integer number (711741492).

Almost surely, 2^8121622780 is an apocalyptic number.

It is an amenable number.

8121622780 is an abundant number, since it is smaller than the sum of its proper divisors (8960173028).

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

8121622780 is a wasteful number, since it uses less digits than its factorization.

8121622780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628293 (or 628291 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 8121622780 is about 90120.0464935521. The cubic root of 8121622780 is about 2010.0842996582.

Adding to 8121622780 its reverse (872261218), we get a palindrome (8993883998).

The spelling of 8121622780 in words is "eight billion, one hundred twenty-one million, six hundred twenty-two thousand, seven hundred eighty".