1491005880 has 480 divisors, whose sum is σ = 6217754400. Its totient is φ = 313777152.

The previous prime is 1491005869. The next prime is 1491005903. The reversal of 1491005880 is 885001941.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3832726 + ... + 3833114.

It is an arithmetic number, because the mean of its divisors is an integer number (12953655).

Almost surely, 2^1491005880 is an apocalyptic number.

1491005880 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 1491005880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3108877200).

1491005880 is an abundant number, since it is smaller than the sum of its proper divisors (4726748520).

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

1491005880 is a wasteful number, since it uses less digits than its factorization.

1491005880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 1491005880 is about 38613.5452917755. The cubic root of 1491005880 is about 1142.4217216582.

The spelling of 1491005880 in words is "one billion, four hundred ninety-one million, five thousand, eight hundred eighty".