84478545 has 20 divisors (see below), whose sum is σ = 151436340. Its totient is φ = 45055008.

The previous prime is 84478529. The next prime is 84478549. The reversal of 84478545 is 54587448.

It can be written as a sum of positive squares in 2 ways, for example, as 47900241 + 36578304 = 6921^2 + 6048^2 .

It is not a de Polignac number, because 84478545 - 2⁴ = 84478529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 84478545.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84478549) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 103890 + ... + 104699.

It is an arithmetic number, because the mean of its divisors is an integer number (7571817).

Almost surely, 2^84478545 is an apocalyptic number.

It is an amenable number.

84478545 is a deficient number, since it is larger than the sum of its proper divisors (66957795).

84478545 is a wasteful number, since it uses less digits than its factorization.

84478545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208606 (or 208597 counting only the distinct ones).

The product of its digits is 716800, while the sum is 45.

The square root of 84478545 is about 9191.2210831858. The cubic root of 84478545 is about 438.7820051165.

The spelling of 84478545 in words is "eighty-four million, four hundred seventy-eight thousand, five hundred forty-five".