84280145 has 4 divisors (see below), whose sum is σ = 101136180. Its totient is φ = 67424112.

The previous prime is 84280139. The next prime is 84280153. The reversal of 84280145 is 54108248.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10182481 + 74097664 = 3191^2 + 8608^2 .

It is a cyclic number.

It is not a de Polignac number, because 84280145 - 2¹⁶ = 84214609 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8428010 + ... + 8428019.

It is an arithmetic number, because the mean of its divisors is an integer number (25284045).

Almost surely, 2^84280145 is an apocalyptic number.

It is an amenable number.

84280145 is a deficient number, since it is larger than the sum of its proper divisors (16856035).

84280145 is a wasteful number, since it uses less digits than its factorization.

84280145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16856034.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 84280145 is about 9180.4218312668. The cubic root of 84280145 is about 438.4382389818.

The spelling of 84280145 in words is "eighty-four million, two hundred eighty thousand, one hundred forty-five".