84787878 has 32 divisors (see below), whose sum is σ = 194181120. Its totient is φ = 24177600.

The previous prime is 84787853. The next prime is 84787889. The reversal of 84787878 is 87878748.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23563 + ... + 26921.

It is an arithmetic number, because the mean of its divisors is an integer number (6068160).

Almost surely, 2^84787878 is an apocalyptic number.

84787878 is an abundant number, since it is smaller than the sum of its proper divisors (109393242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84787878 is a wasteful number, since it uses less digits than its factorization.

84787878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972.

The product of its digits is 5619712, while the sum is 57.

The square root of 84787878 is about 9208.0333405131. The cubic root of 84787878 is about 439.3169118359.

The spelling of 84787878 in words is "eighty-four million, seven hundred eighty-seven thousand, eight hundred seventy-eight".