1128732457 has 4 divisors (see below), whose sum is σ = 1135657360. Its totient is φ = 1121807556.

The previous prime is 1128732431. The next prime is 1128732509. The reversal of 1128732457 is 7542378211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1128732457 - 2²³ = 1120343849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128732257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3462207 + ... + 3462532.

It is an arithmetic number, because the mean of its divisors is an integer number (283914340).

Almost surely, 2^1128732457 is an apocalyptic number.

It is an amenable number.

1128732457 is a deficient number, since it is larger than the sum of its proper divisors (6924903).

1128732457 is an equidigital number, since it uses as much as digits as its factorization.

1128732457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6924902.

The product of its digits is 94080, while the sum is 40.

The square root of 1128732457 is about 33596.6137728194. The cubic root of 1128732457 is about 1041.1908379115.

The spelling of 1128732457 in words is "one billion, one hundred twenty-eight million, seven hundred thirty-two thousand, four hundred fifty-seven".