84509778 has 8 divisors (see below), whose sum is σ = 169019568. Its totient is φ = 28169924.

The previous prime is 84509773. The next prime is 84509791. The reversal of 84509778 is 87790548.

It is a sphenic number, since it is the product of 3 distinct primes.

84509778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (84509773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7042476 + ... + 7042487.

It is an arithmetic number, because the mean of its divisors is an integer number (21127446).

Almost surely, 2^84509778 is an apocalyptic number.

84509778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

84509778 is a wasteful number, since it uses less digits than its factorization.

84509778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14084968.

The product of its (nonzero) digits is 564480, while the sum is 48.

The square root of 84509778 is about 9192.9199931251. The cubic root of 84509778 is about 438.8360732423.

The spelling of 84509778 in words is "eighty-four million, five hundred nine thousand, seven hundred seventy-eight".