872281856691 has 80 divisors (see below), whose sum is σ = 1580273164800. Its totient is φ = 468693827712.

The previous prime is 872281856683. The next prime is 872281856707. The reversal of 872281856691 is 196658182278.

It is not a de Polignac number, because 872281856691 - 2³ = 872281856683 is a prime.

It is a super-2 number, since 2×872281856691² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (872281856651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 202575 + ... + 1336263.

It is an arithmetic number, because the mean of its divisors is an integer number (19753414560).

Almost surely, 2^872281856691 is an apocalyptic number.

872281856691 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

872281856691 is a deficient number, since it is larger than the sum of its proper divisors (707991308109).

872281856691 is a wasteful number, since it uses less digits than its factorization.

872281856691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133790 (or 1133781 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The spelling of 872281856691 in words is "eight hundred seventy-two billion, two hundred eighty-one million, eight hundred fifty-six thousand, six hundred ninety-one".