1978805304 has 384 divisors, whose sum is σ = 6849722880. Its totient is φ = 503193600.

The previous prime is 1978805303. The next prime is 1978805317. The reversal of 1978805304 is 4035088791.

It is a super-2 number, since 2×1978805304² = 7831340862277064832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1978805304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978805303) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15105319 + ... + 15105449.

It is an arithmetic number, because the mean of its divisors is an integer number (17837820).

Almost surely, 2^1978805304 is an apocalyptic number.

1978805304 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978805304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3424861440).

1978805304 is an abundant number, since it is smaller than the sum of its proper divisors (4870917576).

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

1978805304 is a wasteful number, since it uses less digits than its factorization.

1978805304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1978805304 is about 44483.7644989720. The cubic root of 1978805304 is about 1255.4546278591.

The spelling of 1978805304 in words is "one billion, nine hundred seventy-eight million, eight hundred five thousand, three hundred four".