87821445459 has 16 divisors (see below), whose sum is σ = 128151039744. Its totient is φ = 53053970400.

The previous prime is 87821445431. The next prime is 87821445461. The reversal of 87821445459 is 95454412878.

It is not a de Polignac number, because 87821445459 - 2⁷ = 87821445331 is a prime.

It is a super-2 number, since 2×87821445459² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87821445399 and 87821445408.

It is not an unprimeable number, because it can be changed into a prime (87821445419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4268284 + ... + 4288809.

It is an arithmetic number, because the mean of its divisors is an integer number (8009439984).

Almost surely, 2^87821445459 is an apocalyptic number.

87821445459 is a deficient number, since it is larger than the sum of its proper divisors (40329594285).

87821445459 is a wasteful number, since it uses less digits than its factorization.

87821445459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8557418.

The product of its digits is 12902400, while the sum is 57.

The spelling of 87821445459 in words is "eighty-seven billion, eight hundred twenty-one million, four hundred forty-five thousand, four hundred fifty-nine".