7728574381 has 24 divisors (see below), whose sum is σ = 8779994784. Its totient is φ = 6746220000.

The previous prime is 7728574339. The next prime is 7728574397. The reversal of 7728574381 is 1834758277.

It is not a de Polignac number, because 7728574381 - 2⁷ = 7728574253 is a prime.

It is a super-2 number, since 2×7728574381² (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 (7728574081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1382011 + ... + 1387591.

It is an arithmetic number, because the mean of its divisors is an integer number (365833116).

Almost surely, 2^7728574381 is an apocalyptic number.

It is an amenable number.

7728574381 is a deficient number, since it is larger than the sum of its proper divisors (1051420403).

7728574381 is a wasteful number, since it uses less digits than its factorization.

7728574381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5785 (or 5754 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 52.

The square root of 7728574381 is about 87912.3107476990. The cubic root of 7728574381 is about 1977.1204598061.

The spelling of 7728574381 in words is "seven billion, seven hundred twenty-eight million, five hundred seventy-four thousand, three hundred eighty-one".