1281028608 has 400 divisors, whose sum is σ = 4277940480. Its totient is φ = 379551744.

The previous prime is 1281028597. The next prime is 1281028643. The reversal of 1281028608 is 8068201821.

1281028608 is a `hidden beast` number, since 1 + 28 + 1 + 0 + 28 + 608 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16215513 + ... + 16215591.

Almost surely, 2^1281028608 is an apocalyptic number.

1281028608 is a gapful number since it is divisible by the number (18) 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 1281028608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2138970240).

1281028608 is an abundant number, since it is smaller than the sum of its proper divisors (2996911872).

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

1281028608 is an equidigital number, since it uses as much as digits as its factorization.

1281028608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1281028608 is about 35791.4599869857. The cubic root of 1281028608 is about 1086.0578095657.

The spelling of 1281028608 in words is "one billion, two hundred eighty-one million, twenty-eight thousand, six hundred eight".