84947578 has 4 divisors (see below), whose sum is σ = 127421370. Its totient is φ = 42473788.

The previous prime is 84947573. The next prime is 84947581. The reversal of 84947578 is 87574948.

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

It can be written as a sum of positive squares in only one way, i.e., 43125489 + 41822089 = 6567^2 + 6467^2 .

It is not an unprimeable number, because it can be changed into a prime (84947573) 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 as a sum of consecutive naturals, namely, 21236893 + ... + 21236896.

Almost surely, 2^84947578 is an apocalyptic number.

84947578 is a deficient number, since it is larger than the sum of its proper divisors (42473792).

84947578 is a wasteful number, since it uses less digits than its factorization.

84947578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42473791.

The product of its digits is 2257920, while the sum is 52.

The square root of 84947578 is about 9216.7010367051. The cubic root of 84947578 is about 439.5925601551.

The spelling of 84947578 in words is "eighty-four million, nine hundred forty-seven thousand, five hundred seventy-eight".