8638021770 has 64 divisors (see below), whose sum is σ = 23717339136. Its totient is φ = 1972365120.

The previous prime is 8638021729. The next prime is 8638021781. The reversal of 8638021770 is 771208368.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 187357 + ... + 228863.

It is an arithmetic number, because the mean of its divisors is an integer number (370583424).

Almost surely, 2^8638021770 is an apocalyptic number.

8638021770 is an abundant number, since it is smaller than the sum of its proper divisors (15079317366).

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

8638021770 is a wasteful number, since it uses less digits than its factorization.

8638021770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42515.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 8638021770 is about 92940.9585166841. The cubic root of 8638021770 is about 2051.8145163860.

The spelling of 8638021770 in words is "eight billion, six hundred thirty-eight million, twenty-one thousand, seven hundred seventy".