84778469 has 4 divisors (see below), whose sum is σ = 85446144. Its totient is φ = 84110796.

The previous prime is 84778453. The next prime is 84778481. The reversal of 84778469 is 96487748.

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 84778469 - 2⁴ = 84778453 is a prime.

It is a super-2 number, since 2×84778469² = 14374777611967922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84778469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84778489) 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, 333647 + ... + 333900.

It is an arithmetic number, because the mean of its divisors is an integer number (21361536).

Almost surely, 2^84778469 is an apocalyptic number.

It is an amenable number.

84778469 is a deficient number, since it is larger than the sum of its proper divisors (667675).

84778469 is a wasteful number, since it uses less digits than its factorization.

84778469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667674.

The product of its digits is 2709504, while the sum is 53.

The square root of 84778469 is about 9207.5224137658. The cubic root of 84778469 is about 439.3006607481.

The spelling of 84778469 in words is "eighty-four million, seven hundred seventy-eight thousand, four hundred sixty-nine".