84778982 has 4 divisors (see below), whose sum is σ = 127168476. Its totient is φ = 42389490.

The previous prime is 84778973. The next prime is 84778987. The reversal of 84778982 is 28987748.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84778987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21194744 + ... + 21194747.

It is an arithmetic number, because the mean of its divisors is an integer number (31792119).

Almost surely, 2^84778982 is an apocalyptic number.

84778982 is a deficient number, since it is larger than the sum of its proper divisors (42389494).

84778982 is a wasteful number, since it uses less digits than its factorization.

84778982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42389493.

The product of its digits is 1806336, while the sum is 53.

The square root of 84778982 is about 9207.5502713805. The cubic root of 84778982 is about 439.3015468253.

The spelling of 84778982 in words is "eighty-four million, seven hundred seventy-eight thousand, nine hundred eighty-two".