7581428552 has 8 divisors (see below), whose sum is σ = 14215178550. Its totient is φ = 3790714272.

The previous prime is 7581428539. The next prime is 7581428557. The reversal of 7581428552 is 2558241857.

It can be written as a sum of positive squares in only one way, i.e., 7366102276 + 215326276 = 85826^2 + 14674^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 7581428497 and 7581428506.

It is not an unprimeable number, because it can be changed into a prime (7581428557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473839277 + ... + 473839292.

Almost surely, 2^7581428552 is an apocalyptic number.

It is an amenable number.

7581428552 is a deficient number, since it is larger than the sum of its proper divisors (6633749998).

7581428552 is a wasteful number, since it uses less digits than its factorization.

7581428552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947678575 (or 947678571 counting only the distinct ones).

The product of its digits is 896000, while the sum is 47.

The square root of 7581428552 is about 87071.3991618373. The cubic root of 7581428552 is about 1964.4923811420.

The spelling of 7581428552 in words is "seven billion, five hundred eighty-one million, four hundred twenty-eight thousand, five hundred fifty-two".