1978325828 has 24 divisors (see below), whose sum is σ = 3769953600. Its totient is φ = 904786848.

The previous prime is 1978325813. The next prime is 1978325851. The reversal of 1978325828 is 8285238791.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1978325828.

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, 446600 + ... + 451007.

It is an arithmetic number, because the mean of its divisors is an integer number (157081400).

Almost surely, 2^1978325828 is an apocalyptic number.

It is an amenable number.

1978325828 is a deficient number, since it is larger than the sum of its proper divisors (1791627772).

1978325828 is a wasteful number, since it uses less digits than its factorization.

1978325828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897659 (or 897657 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 53.

The square root of 1978325828 is about 44478.3748354186. The cubic root of 1978325828 is about 1255.3532183558.

The spelling of 1978325828 in words is "one billion, nine hundred seventy-eight million, three hundred twenty-five thousand, eight hundred twenty-eight".