1378535620 has 144 divisors (see below), whose sum is σ = 3764517120. Its totient is φ = 419059200.

The previous prime is 1378535611. The next prime is 1378535687. The reversal of 1378535620 is 265358731.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 440421 + ... + 443539.

It is an arithmetic number, because the mean of its divisors is an integer number (26142480).

Almost surely, 2^1378535620 is an apocalyptic number.

1378535620 is a gapful number since it is divisible by the number (10) 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 1378535620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1882258560).

1378535620 is an abundant number, since it is smaller than the sum of its proper divisors (2385981500).

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

1378535620 is a wasteful number, since it uses less digits than its factorization.

1378535620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194 (or 3185 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 1378535620 is about 37128.6361182309. The cubic root of 1378535620 is about 1112.9423384286.

The spelling of 1378535620 in words is "one billion, three hundred seventy-eight million, five hundred thirty-five thousand, six hundred twenty".