1378320636 has 96 divisors (see below), whose sum is σ = 4139089920. Its totient is φ = 346449600.

The previous prime is 1378320617. The next prime is 1378320641. The reversal of 1378320636 is 6360238731.

It is a junction number, because it is equal to n+sod(n) for n = 1378320594 and 1378320603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4585 + ... + 52703.

It is an arithmetic number, because the mean of its divisors is an integer number (43115520).

Almost surely, 2^1378320636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1378320636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2069544960).

1378320636 is an abundant number, since it is smaller than the sum of its proper divisors (2760769284).

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

1378320636 is a wasteful number, since it uses less digits than its factorization.

1378320636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48175 (or 48173 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 1378320636 is about 37125.7408814962. The cubic root of 1378320636 is about 1112.8844805996.

The spelling of 1378320636 in words is "one billion, three hundred seventy-eight million, three hundred twenty thousand, six hundred thirty-six".