8281611972840 has 128 divisors (see below), whose sum is σ = 26153349465600. Its totient is φ = 2092125461760.

The previous prime is 8281611972839. The next prime is 8281611972857. The reversal of 8281611972840 is 482791161828.

It is a Cunningham number, because it is equal to 2877779²-1.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109317775 + ... + 109393505.

It is an arithmetic number, because the mean of its divisors is an integer number (204323042700).

Almost surely, 2^{8281611972840} is an apocalyptic number.

It is an amenable number.

8281611972840 is an abundant number, since it is smaller than the sum of its proper divisors (17871737492760).

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

8281611972840 is a wasteful number, since it uses less digits than its factorization.

8281611972840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123727 (or 123723 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 57.

The spelling of 8281611972840 in words is "eight trillion, two hundred eighty-one billion, six hundred eleven million, nine hundred seventy-two thousand, eight hundred forty".