84456778 has 16 divisors (see below), whose sum is σ = 145926144. Its totient is φ = 35910000.

The previous prime is 84456751. The next prime is 84456793. The reversal of 84456778 is 87765448.

It is a happy number.

It is an unprimeable number.

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, 21973 + ... + 25528.

It is an arithmetic number, because the mean of its divisors is an integer number (9120384).

Almost surely, 2^84456778 is an apocalyptic number.

84456778 is a deficient number, since it is larger than the sum of its proper divisors (61469366).

84456778 is a wasteful number, since it uses less digits than its factorization.

84456778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47637.

The product of its digits is 1505280, while the sum is 49.

The square root of 84456778 is about 9190.0368878476. The cubic root of 84456778 is about 438.7443159086.

The spelling of 84456778 in words is "eighty-four million, four hundred fifty-six thousand, seven hundred seventy-eight".