84578638 has 16 divisors (see below), whose sum is σ = 134506224. Its totient is φ = 39749760.

The previous prime is 84578629. The next prime is 84578639. The reversal of 84578638 is 83687548.

It is a junction number, because it is equal to n+sod(n) for n = 84578591 and 84578600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84578639) 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 7 ways as a sum of consecutive naturals, for example, 41053 + ... + 43063.

It is an arithmetic number, because the mean of its divisors is an integer number (8406639).

Almost surely, 2^84578638 is an apocalyptic number.

84578638 is a deficient number, since it is larger than the sum of its proper divisors (49927586).

84578638 is a wasteful number, since it uses less digits than its factorization.

84578638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3267.

The product of its digits is 1290240, while the sum is 49.

The square root of 84578638 is about 9196.6645040471. The cubic root of 84578638 is about 438.9552312419.

The spelling of 84578638 in words is "eighty-four million, five hundred seventy-eight thousand, six hundred thirty-eight".