84364578 has 80 divisors (see below), whose sum is σ = 198215424. Its totient is φ = 26788320.

The previous prime is 84364573. The next prime is 84364589. The reversal of 84364578 is 87546348.

It is a super-2 number, since 2×84364578² = 14234764042236168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84364571) 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 39 ways as a sum of consecutive naturals, for example, 537276 + ... + 537432.

Almost surely, 2^84364578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84364578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99107712).

84364578 is an abundant number, since it is smaller than the sum of its proper divisors (113850846).

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

84364578 is a wasteful number, since it uses less digits than its factorization.

84364578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 300 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 84364578 is about 9185.0192160931. The cubic root of 84364578 is about 438.5846012548.

The spelling of 84364578 in words is "eighty-four million, three hundred sixty-four thousand, five hundred seventy-eight".