1491326780 has 48 divisors (see below), whose sum is σ = 3189170880. Its totient is φ = 585638400.

The previous prime is 1491326741. The next prime is 1491326783. The reversal of 1491326780 is 876231941.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491326783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 986225 + ... + 987735.

It is an arithmetic number, because the mean of its divisors is an integer number (66441060).

Almost surely, 2^1491326780 is an apocalyptic number.

1491326780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1491326780 is an abundant number, since it is smaller than the sum of its proper divisors (1697844100).

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

1491326780 is a wasteful number, since it uses less digits than its factorization.

1491326780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390 (or 2388 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1491326780 is about 38617.7003458259. The cubic root of 1491326780 is about 1142.5036745728.

The spelling of 1491326780 in words is "one billion, four hundred ninety-one million, three hundred twenty-six thousand, seven hundred eighty".