7128543412 has 6 divisors (see below), whose sum is σ = 12474950978. Its totient is φ = 3564271704.

The previous prime is 7128543379. The next prime is 7128543413. The reversal of 7128543412 is 2143458217.

It can be written as a sum of positive squares in only one way, i.e., 4195671076 + 2932872336 = 64774^2 + 54156^2 .

It is a super-2 number, since 2×7128543412² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7128543413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 891067923 + ... + 891067930.

Almost surely, 2^7128543412 is an apocalyptic number.

It is an amenable number.

7128543412 is a deficient number, since it is larger than the sum of its proper divisors (5346407566).

7128543412 is a wasteful number, since it uses less digits than its factorization.

7128543412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782135857 (or 1782135855 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 7128543412 is about 84430.7018329233. The cubic root of 7128543412 is about 1924.5695028335.

The spelling of 7128543412 in words is "seven billion, one hundred twenty-eight million, five hundred forty-three thousand, four hundred twelve".