1381553680 has 40 divisors (see below), whose sum is σ = 3459200472. Its totient is φ = 510111744.

The previous prime is 1381553639. The next prime is 1381553717. The reversal of 1381553680 is 863551831.

It can be written as a sum of positive squares in 4 ways, for example, as 2471184 + 1379082496 = 1572^2 + 37136^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 663169 + ... + 665248.

Almost surely, 2^1381553680 is an apocalyptic number.

1381553680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381553680 is an abundant number, since it is smaller than the sum of its proper divisors (2077646792).

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

1381553680 is a wasteful number, since it uses less digits than its factorization.

1381553680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328443 (or 1328437 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 1381553680 is about 37169.2571892418. The cubic root of 1381553680 is about 1113.7539432513.

The spelling of 1381553680 in words is "one billion, three hundred eighty-one million, five hundred fifty-three thousand, six hundred eighty".