1228640771 has 8 divisors (see below), whose sum is σ = 1255644480. Its totient is φ = 1201673088.

The previous prime is 1228640737. The next prime is 1228640789. The reversal of 1228640771 is 1770468221.

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 1228640771 - 2²⁶ = 1161531907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1228640731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66875 + ... + 83243.

It is an arithmetic number, because the mean of its divisors is an integer number (156955560).

Almost surely, 2^1228640771 is an apocalyptic number.

1228640771 is a deficient number, since it is larger than the sum of its proper divisors (27003709).

1228640771 is a wasteful number, since it uses less digits than its factorization.

1228640771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18013.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 1228640771 is about 35051.9724266695. The cubic root of 1228640771 is about 1071.0464537497.

The spelling of 1228640771 in words is "one billion, two hundred twenty-eight million, six hundred forty thousand, seven hundred seventy-one".