1491288128 has 56 divisors (see below), whose sum is σ = 3232916064. Its totient is φ = 676889600.

The previous prime is 1491288119. The next prime is 1491288133. The reversal of 1491288128 is 8218821941.

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 771323 + ... + 773253.

It is an arithmetic number, because the mean of its divisors is an integer number (57730644).

Almost surely, 2^1491288128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491288128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1616458032).

1491288128 is an abundant number, since it is smaller than the sum of its proper divisors (1741627936).

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

1491288128 is a wasteful number, since it uses less digits than its factorization.

1491288128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051 (or 3041 counting only the distinct ones).

The product of its digits is 73728, while the sum is 44.

The square root of 1491288128 is about 38617.1998984908. The cubic root of 1491288128 is about 1142.4938040705.

The spelling of 1491288128 in words is "one billion, four hundred ninety-one million, two hundred eighty-eight thousand, one hundred twenty-eight".