1281628235 has 8 divisors (see below), whose sum is σ = 1539762000. Its totient is φ = 1024097184.

The previous prime is 1281628217. The next prime is 1281628253. The reversal of 1281628235 is 5328261821.

It is an interprime number because it is at equal distance from previous prime (1281628217) and next prime (1281628253).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281628235 - 2¹² = 1281624139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145985 + ... + 154514.

It is an arithmetic number, because the mean of its divisors is an integer number (192470250).

Almost surely, 2^1281628235 is an apocalyptic number.

1281628235 is a deficient number, since it is larger than the sum of its proper divisors (258133765).

1281628235 is an equidigital number, since it uses as much as digits as its factorization.

1281628235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301357.

The product of its digits is 46080, while the sum is 38.

The square root of 1281628235 is about 35799.8356839805. The cubic root of 1281628235 is about 1086.2272379971.

The spelling of 1281628235 in words is "one billion, two hundred eighty-one million, six hundred twenty-eight thousand, two hundred thirty-five".