1266558428 has 12 divisors (see below), whose sum is σ = 2254045080. Its totient is φ = 622545552.

The previous prime is 1266558367. The next prime is 1266558479. The reversal of 1266558428 is 8248556621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2683151 + ... + 2683622.

It is an arithmetic number, because the mean of its divisors is an integer number (187837090).

Almost surely, 2^1266558428 is an apocalyptic number.

It is an amenable number.

1266558428 is a deficient number, since it is larger than the sum of its proper divisors (987486652).

1266558428 is a wasteful number, since it uses less digits than its factorization.

1266558428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5366836 (or 5366834 counting only the distinct ones).

The product of its digits is 921600, while the sum is 47.

The square root of 1266558428 is about 35588.7401856261. The cubic root of 1266558428 is about 1081.9530355690.

The spelling of 1266558428 in words is "one billion, two hundred sixty-six million, five hundred fifty-eight thousand, four hundred twenty-eight".