84047978 has 32 divisors (see below), whose sum is σ = 148176000. Its totient is φ = 35011584.

The previous prime is 84047969. The next prime is 84047981. The reversal of 84047978 is 87974048.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 79598 + ... + 80646.

It is an arithmetic number, because the mean of its divisors is an integer number (4630500).

Almost surely, 2^84047978 is an apocalyptic number.

84047978 is a deficient number, since it is larger than the sum of its proper divisors (64128022).

84047978 is a wasteful number, since it uses less digits than its factorization.

84047978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 84047978 is about 9167.7684307578. The cubic root of 84047978 is about 438.0352792973.

The spelling of 84047978 in words is "eighty-four million, forty-seven thousand, nine hundred seventy-eight".