84478212 has 144 divisors (see below), whose sum is σ = 266378112. Its totient is φ = 21980160.

The previous prime is 84478201. The next prime is 84478217. The reversal of 84478212 is 21287448.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (84478217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 350412 + ... + 350652.

It is an arithmetic number, because the mean of its divisors is an integer number (1849848).

Almost surely, 2^84478212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84478212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133189056).

84478212 is an abundant number, since it is smaller than the sum of its proper divisors (181899900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84478212 is a wasteful number, since it uses less digits than its factorization.

84478212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 373 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 84478212 is about 9191.2029680559. The cubic root of 84478212 is about 438.7814285812.

The spelling of 84478212 in words is "eighty-four million, four hundred seventy-eight thousand, two hundred twelve".