1378668820 has 24 divisors (see below), whose sum is σ = 2918006784. Its totient is φ = 547124256.

The previous prime is 1378668791. The next prime is 1378668827. The reversal of 1378668820 is 288668731.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378668827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268852 + ... + 273931.

It is an arithmetic number, because the mean of its divisors is an integer number (121583616).

Almost surely, 2^1378668820 is an apocalyptic number.

1378668820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1378668820 is an abundant number, since it is smaller than the sum of its proper divisors (1539337964).

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

1378668820 is a wasteful number, since it uses less digits than its factorization.

1378668820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542919 (or 542917 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 1378668820 is about 37130.4298386108. The cubic root of 1378668820 is about 1112.9781830217.

The spelling of 1378668820 in words is "one billion, three hundred seventy-eight million, six hundred sixty-eight thousand, eight hundred twenty".