1128264761 has 4 divisors (see below), whose sum is σ = 1215054372. Its totient is φ = 1041475152.

The previous prime is 1128264727. The next prime is 1128264799. The reversal of 1128264761 is 1674628211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271590400 + 856674361 = 16480^2 + 29269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128264761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128264661) 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, 43394786 + ... + 43394811.

It is an arithmetic number, because the mean of its divisors is an integer number (303763593).

Almost surely, 2^1128264761 is an apocalyptic number.

It is an amenable number.

1128264761 is a deficient number, since it is larger than the sum of its proper divisors (86789611).

1128264761 is an equidigital number, since it uses as much as digits as its factorization.

1128264761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86789610.

The product of its digits is 32256, while the sum is 38.

The square root of 1128264761 is about 33589.6525882600. The cubic root of 1128264761 is about 1041.0470104819.

The spelling of 1128264761 in words is "one billion, one hundred twenty-eight million, two hundred sixty-four thousand, seven hundred sixty-one".