1491103728 has 100 divisors (see below), whose sum is σ = 4569618240. Its totient is φ = 467790336.

The previous prime is 1491103721. The next prime is 1491103729. The reversal of 1491103728 is 8273011941.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1491103692 and 1491103701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491103721) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11808 + ... + 55871.

Almost surely, 2^1491103728 is an apocalyptic number.

1491103728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1491103728 is an abundant number, since it is smaller than the sum of its proper divisors (3078514512).

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

1491103728 is a wasteful number, since it uses less digits than its factorization.

1491103728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67716 (or 67701 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1491103728 is about 38614.8122875147. The cubic root of 1491103728 is about 1142.4467117754.

The spelling of 1491103728 in words is "one billion, four hundred ninety-one million, one hundred three thousand, seven hundred twenty-eight".