1266032128 has 20 divisors (see below), whose sum is σ = 2529592560. Its totient is φ = 633015808.

The previous prime is 1266032113. The next prime is 1266032129. The reversal of 1266032128 is 8212306621.

It is a self number, because there is not a number n which added to its sum of digits gives 1266032128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266032129) 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 as a sum of consecutive naturals, namely, 1235848 + ... + 1236871.

It is an arithmetic number, because the mean of its divisors is an integer number (126479628).

Almost surely, 2^1266032128 is an apocalyptic number.

It is an amenable number.

1266032128 is a deficient number, since it is larger than the sum of its proper divisors (1263560432).

1266032128 is an frugal number, since it uses more digits than its factorization.

1266032128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472737 (or 2472721 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1266032128 is about 35581.3452247101. The cubic root of 1266032128 is about 1081.8031515049.

Adding to 1266032128 its reverse (8212306621), we get a palindrome (9478338749).

The spelling of 1266032128 in words is "one billion, two hundred sixty-six million, thirty-two thousand, one hundred twenty-eight".