84078819 has 24 divisors (see below), whose sum is σ = 139464000. Its totient is φ = 48273840.

The previous prime is 84078811. The next prime is 84078847. The reversal of 84078819 is 91887048.

It is not a de Polignac number, because 84078819 - 2³ = 84078811 is a prime.

It is a super-2 number, since 2×84078819² = 14138495608869522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84078811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20469 + ... + 24230.

It is an arithmetic number, because the mean of its divisors is an integer number (5811000).

Almost surely, 2^84078819 is an apocalyptic number.

84078819 is a deficient number, since it is larger than the sum of its proper divisors (55385181).

84078819 is a wasteful number, since it uses less digits than its factorization.

84078819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44735 (or 44732 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 84078819 is about 9169.4503106784. The cubic root of 84078819 is about 438.0888510559.

The spelling of 84078819 in words is "eighty-four million, seventy-eight thousand, eight hundred nineteen".