1491988680 has 1024 divisors, whose sum is σ = 6967296000. Its totient is φ = 274710528.

The previous prime is 1491988649. The next prime is 1491988717. The reversal of 1491988680 is 868891941.

1491988680 is a `hidden beast` number, since 1 + 491 + 98 + 8 + 68 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 31744417 + ... + 31744463.

It is an arithmetic number, because the mean of its divisors is an integer number (6804000).

Almost surely, 2^1491988680 is an apocalyptic number.

1491988680 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 1491988680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3483648000).

1491988680 is an abundant number, since it is smaller than the sum of its proper divisors (5475307320).

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

1491988680 is a wasteful number, since it uses less digits than its factorization.

1491988680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The square root of 1491988680 is about 38626.2692995324. The cubic root of 1491988680 is about 1142.6726765070.

The spelling of 1491988680 in words is "one billion, four hundred ninety-one million, nine hundred eighty-eight thousand, six hundred eighty".