1228648657 has 6 divisors (see below), whose sum is σ = 1241664018. Its totient is φ = 1215640512.

The previous prime is 1228648621. The next prime is 1228648693. The reversal of 1228648657 is 7568468221.

It is an interprime number because it is at equal distance from previous prime (1228648621) and next prime (1228648693).

It can be written as a sum of positive squares in only one way, i.e., 1025984961 + 202663696 = 32031^2 + 14236^2 .

It is not a de Polignac number, because 1228648657 - 2¹⁵ = 1228615889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228648657.

It is not an unprimeable number, because it can be changed into a prime (1228648697) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 343444 + ... + 347002.

It is an arithmetic number, because the mean of its divisors is an integer number (206944003).

Almost surely, 2^1228648657 is an apocalyptic number.

It is an amenable number.

1228648657 is a deficient number, since it is larger than the sum of its proper divisors (13015361).

1228648657 is an frugal number, since it uses more digits than its factorization.

1228648657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7215 (or 3656 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 49.

The square root of 1228648657 is about 35052.0849165923. The cubic root of 1228648657 is about 1071.0487452397.

The spelling of 1228648657 in words is "one billion, two hundred twenty-eight million, six hundred forty-eight thousand, six hundred fifty-seven".