1378637880 has 64 divisors (see below), whose sum is σ = 4176900000. Its totient is φ = 363993600.

The previous prime is 1378637867. The next prime is 1378637951. The reversal of 1378637880 is 887368731.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44755 + ... + 68994.

Almost surely, 2^1378637880 is an apocalyptic number.

1378637880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1378637880 is an abundant number, since it is smaller than the sum of its proper divisors (2798262120).

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

1378637880 is a wasteful number, since it uses less digits than its factorization.

1378637880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113864 (or 113860 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 51.

The square root of 1378637880 is about 37130.0131968735. The cubic root of 1378637880 is about 1112.9698571636.

The spelling of 1378637880 in words is "one billion, three hundred seventy-eight million, six hundred thirty-seven thousand, eight hundred eighty".