84028978 has 16 divisors (see below), whose sum is σ = 137648160. Its totient is φ = 38154400.

The previous prime is 84028969. The next prime is 84028991. The reversal of 84028978 is 87982048.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31293 + ... + 33871.

It is an arithmetic number, because the mean of its divisors is an integer number (8603010).

Almost surely, 2^84028978 is an apocalyptic number.

84028978 is a deficient number, since it is larger than the sum of its proper divisors (53619182).

84028978 is a wasteful number, since it uses less digits than its factorization.

84028978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 84028978 is about 9166.7321330996. The cubic root of 84028978 is about 438.0022691931.

The spelling of 84028978 in words is "eighty-four million, twenty-eight thousand, nine hundred seventy-eight".