1282628657 has 4 divisors (see below), whose sum is σ = 1283428416. Its totient is φ = 1281828900.

The previous prime is 1282628653. The next prime is 1282628663. The reversal of 1282628657 is 7568262821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1282628657 - 2² = 1282628653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1282628653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397469 + ... + 400682.

It is an arithmetic number, because the mean of its divisors is an integer number (320857104).

Almost surely, 2^1282628657 is an apocalyptic number.

It is an amenable number.

1282628657 is a deficient number, since it is larger than the sum of its proper divisors (799759).

1282628657 is an equidigital number, since it uses as much as digits as its factorization.

1282628657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799758.

The product of its digits is 645120, while the sum is 47.

The square root of 1282628657 is about 35813.8053968019. The cubic root of 1282628657 is about 1086.5097960141.

The spelling of 1282628657 in words is "one billion, two hundred eighty-two million, six hundred twenty-eight thousand, six hundred fifty-seven".