8400646780 has 12 divisors (see below), whose sum is σ = 17641358280. Its totient is φ = 3360258704.

The previous prime is 8400646741. The next prime is 8400646801. The reversal of 8400646780 is 876460048.

It is a super-3 number, since 3×8400646780³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210016150 + ... + 210016189.

It is an arithmetic number, because the mean of its divisors is an integer number (1470113190).

Almost surely, 2^8400646780 is an apocalyptic number.

It is an amenable number.

8400646780 is an abundant number, since it is smaller than the sum of its proper divisors (9240711500).

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

8400646780 is a wasteful number, since it uses less digits than its factorization.

8400646780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420032348 (or 420032346 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 8400646780 is about 91655.0423053746. The cubic root of 8400646780 is about 2032.8448856903.

The spelling of 8400646780 in words is "eight billion, four hundred million, six hundred forty-six thousand, seven hundred eighty".