1282391880 has 512 divisors, whose sum is σ = 5127045120. Its totient is φ = 250905600.

The previous prime is 1282391839. The next prime is 1282391939. The reversal of 1282391880 is 881932821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 34659222 + ... + 34659258.

It is an arithmetic number, because the mean of its divisors is an integer number (10013760).

Almost surely, 2^1282391880 is an apocalyptic number.

1282391880 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 1282391880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2563522560).

1282391880 is an abundant number, since it is smaller than the sum of its proper divisors (3844653240).

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

1282391880 is a wasteful number, since it uses less digits than its factorization.

1282391880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 1282391880 is about 35810.4995776378. The cubic root of 1282391880 is about 1086.4429342713.

The spelling of 1282391880 in words is "one billion, two hundred eighty-two million, three hundred ninety-one thousand, eight hundred eighty".