1128221679 has 16 divisors (see below), whose sum is σ = 1624374752. Its totient is φ = 692419968.

The previous prime is 1128221671. The next prime is 1128221687. The reversal of 1128221679 is 9761228211.

It is an interprime number because it is at equal distance from previous prime (1128221671) and next prime (1128221687).

It is not a de Polignac number, because 1128221679 - 2³ = 1128221671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128221671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24232 + ... + 53325.

It is an arithmetic number, because the mean of its divisors is an integer number (101523422).

Almost surely, 2^1128221679 is an apocalyptic number.

1128221679 is a deficient number, since it is larger than the sum of its proper divisors (496153073).

1128221679 is a wasteful number, since it uses less digits than its factorization.

1128221679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77946.

The product of its digits is 24192, while the sum is 39.

The square root of 1128221679 is about 33589.0112834540. The cubic root of 1128221679 is about 1041.0337597628.

The spelling of 1128221679 in words is "one billion, one hundred twenty-eight million, two hundred twenty-one thousand, six hundred seventy-nine".