1199742728 has 16 divisors (see below), whose sum is σ = 2251710780. Its totient is φ = 599286528.

The previous prime is 1199742703. The next prime is 1199742763. The reversal of 1199742728 is 8272479911.

It can be written as a sum of positive squares in 2 ways, for example, as 723717604 + 476025124 = 26902^2 + 21818^2 .

It is a super-2 number, since 2×1199742728² = 2878765226777763968, which contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 64325 + ... + 80852.

Almost surely, 2^1199742728 is an apocalyptic number.

It is an amenable number.

1199742728 is a deficient number, since it is larger than the sum of its proper divisors (1051968052).

1199742728 is a wasteful number, since it uses less digits than its factorization.

1199742728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146216 (or 146212 counting only the distinct ones).

The product of its digits is 508032, while the sum is 50.

The square root of 1199742728 is about 34637.3025508627. The cubic root of 1199742728 is about 1062.5826214505.

The spelling of 1199742728 in words is "one billion, one hundred ninety-nine million, seven hundred forty-two thousand, seven hundred twenty-eight".