1128402805 has 16 divisors (see below), whose sum is σ = 1369350000. Its totient is φ = 892569600.

The previous prime is 1128402749. The next prime is 1128402809. The reversal of 1128402805 is 5082048211.

It can be written as a sum of positive squares in 8 ways, for example, as 214066161 + 914336644 = 14631^2 + 30238^2 .

It is not a de Polignac number, because 1128402805 - 2¹³ = 1128394613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128402809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 629851 + ... + 631639.

It is an arithmetic number, because the mean of its divisors is an integer number (85584375).

Almost surely, 2^1128402805 is an apocalyptic number.

It is an amenable number.

1128402805 is a deficient number, since it is larger than the sum of its proper divisors (240947195).

1128402805 is a wasteful number, since it uses less digits than its factorization.

1128402805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 1128402805 is about 33591.7073844126. The cubic root of 1128402805 is about 1041.0894663657.

The spelling of 1128402805 in words is "one billion, one hundred twenty-eight million, four hundred two thousand, eight hundred five".