1881538560 has 432 divisors, whose sum is σ = 7360975440. Its totient is φ = 440401920.

The previous prime is 1881538559. The next prime is 1881538567. The reversal of 1881538560 is 658351881.

1881538560 is a `hidden beast` number, since 1 + 8 + 81 + 5 + 3 + 8 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881538567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64880626 + ... + 64880654.

It is an arithmetic number, because the mean of its divisors is an integer number (17039295).

Almost surely, 2^1881538560 is an apocalyptic number.

1881538560 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 1881538560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3680487720).

1881538560 is an abundant number, since it is smaller than the sum of its proper divisors (5479436880).

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

1881538560 is an equidigital number, since it uses as much as digits as its factorization.

1881538560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 1881538560 is about 43376.7052690727. The cubic root of 1881538560 is about 1234.5377498253.

It can be divided in two parts, 18815 and 38560, that added together give a palindrome (57375).

The spelling of 1881538560 in words is "one billion, eight hundred eighty-one million, five hundred thirty-eight thousand, five hundred sixty".