84427872449 has 4 divisors (see below), whose sum is σ = 88098649536. Its totient is φ = 80757095364.

The previous prime is 84427872443. The next prime is 84427872457. The reversal of 84427872449 is 94427872448.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84427872449 - 2³⁶ = 15708395713 is a prime.

It is a super-2 number, since 2×84427872449² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84427872443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835388509 + ... + 1835388554.

It is an arithmetic number, because the mean of its divisors is an integer number (22024662384).

Almost surely, 2^84427872449 is an apocalyptic number.

It is an amenable number.

84427872449 is a deficient number, since it is larger than the sum of its proper divisors (3670777087).

84427872449 is a wasteful number, since it uses less digits than its factorization.

84427872449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670777086.

The product of its digits is 28901376, while the sum is 59.

Subtracting 84427872449 from its reverse (94427872448), we obtain a palindrome (9999999999).

The spelling of 84427872449 in words is "eighty-four billion, four hundred twenty-seven million, eight hundred seventy-two thousand, four hundred forty-nine".