78821146 has 16 divisors (see below), whose sum is σ = 125352576. Its totient is φ = 37043136.

The previous prime is 78821131. The next prime is 78821191. The reversal of 78821146 is 64112887.

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, 44245 + ... + 45991.

It is an arithmetic number, because the mean of its divisors is an integer number (7834536).

Almost surely, 2^78821146 is an apocalyptic number.

78821146 is a deficient number, since it is larger than the sum of its proper divisors (46531430).

78821146 is a wasteful number, since it uses less digits than its factorization.

78821146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093.

The product of its digits is 21504, while the sum is 37.

The square root of 78821146 is about 8878.1273926431. The cubic root of 78821146 is about 428.7599862243.

The spelling of 78821146 in words is "seventy-eight million, eight hundred twenty-one thousand, one hundred forty-six".