7528308381 has 12 divisors (see below), whose sum is σ = 11862789120. Its totient is φ = 4562611080.

The previous prime is 7528308353. The next prime is 7528308391. The reversal of 7528308381 is 1838038257.

It is not a de Polignac number, because 7528308381 - 2⁵ = 7528308349 is a prime.

It is a super-2 number, since 2×7528308381² (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 (7528308391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38021661 + ... + 38021858.

It is an arithmetic number, because the mean of its divisors is an integer number (988565760).

Almost surely, 2^7528308381 is an apocalyptic number.

It is an amenable number.

7528308381 is a deficient number, since it is larger than the sum of its proper divisors (4334480739).

7528308381 is a wasteful number, since it uses less digits than its factorization.

7528308381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76043536 (or 76043533 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 7528308381 is about 86765.8249600613. The cubic root of 7528308381 is about 1959.8934744444.

The spelling of 7528308381 in words is "seven billion, five hundred twenty-eight million, three hundred eight thousand, three hundred eighty-one".