84676978 has 4 divisors (see below), whose sum is σ = 127015470. Its totient is φ = 42338488.

The previous prime is 84676973. The next prime is 84677009. The reversal of 84676978 is 87967648.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 76685049 + 7991929 = 8757^2 + 2827^2 .

It is not an unprimeable number, because it can be changed into a prime (84676973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21169243 + ... + 21169246.

Almost surely, 2^84676978 is an apocalyptic number.

84676978 is a deficient number, since it is larger than the sum of its proper divisors (42338492).

84676978 is a wasteful number, since it uses less digits than its factorization.

84676978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42338491.

The product of its digits is 4064256, while the sum is 55.

The square root of 84676978 is about 9202.0094544616. The cubic root of 84676978 is about 439.1252904876.

The spelling of 84676978 in words is "eighty-four million, six hundred seventy-six thousand, nine hundred seventy-eight".