84521745 has 128 divisors (see below), whose sum is σ = 192430080. Its totient is φ = 34179840.

The previous prime is 84521743. The next prime is 84521753. The reversal of 84521745 is 54712548.

It is not a de Polignac number, because 84521745 - 2¹ = 84521743 is a prime.

Together with 107908335 it forms an amicable pair .

It is not an unprimeable number, because it can be changed into a prime (84521741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 488479 + ... + 488651.

It is an arithmetic number, because the mean of its divisors is an integer number (1503360).

Almost surely, 2^84521745 is an apocalyptic number.

It is an amenable number.

84521745 is an abundant number, since it is smaller than the sum of its proper divisors (107908335).

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

84521745 is a wasteful number, since it uses less digits than its factorization.

84521745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 246 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 84521745 is about 9193.5708514157. The cubic root of 84521745 is about 438.8567860464.

The spelling of 84521745 in words is "eighty-four million, five hundred twenty-one thousand, seven hundred forty-five".