82267821987 has 32 divisors (see below), whose sum is σ = 119081648448. Its totient is φ = 50218285056.

The previous prime is 82267821983. The next prime is 82267821989. The reversal of 82267821987 is 78912876228.

It is not a de Polignac number, because 82267821987 - 2² = 82267821983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82267821987.

It is not an unprimeable number, because it can be changed into a prime (82267821983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7971943 + ... + 7982255.

It is an arithmetic number, because the mean of its divisors is an integer number (3721301514).

Almost surely, 2^82267821987 is an apocalyptic number.

82267821987 is a deficient number, since it is larger than the sum of its proper divisors (36813826461).

82267821987 is a wasteful number, since it uses less digits than its factorization.

82267821987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11959.

The product of its digits is 10838016, while the sum is 60.

The spelling of 82267821987 in words is "eighty-two billion, two hundred sixty-seven million, eight hundred twenty-one thousand, nine hundred eighty-seven".