1491788760 has 256 divisors, whose sum is σ = 5908515840. Its totient is φ = 291717120.

The previous prime is 1491788759. The next prime is 1491788761. The reversal of 1491788760 is 678871941.

It is an interprime number because it is at equal distance from previous prime (1491788759) and next prime (1491788761).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491788761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 152332 + ... + 161828.

It is an arithmetic number, because the mean of its divisors is an integer number (23080140).

Almost surely, 2^1491788760 is an apocalyptic number.

1491788760 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 1491788760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2954257920).

1491788760 is an abundant number, since it is smaller than the sum of its proper divisors (4416727080).

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

1491788760 is a wasteful number, since it uses less digits than its factorization.

1491788760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9546 (or 9542 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 51.

The square root of 1491788760 is about 38623.6813367136. The cubic root of 1491788760 is about 1142.6216365028.

The spelling of 1491788760 in words is "one billion, four hundred ninety-one million, seven hundred eighty-eight thousand, seven hundred sixty".