7728246981 has 48 divisors (see below), whose sum is σ = 13927420416. Its totient is φ = 4020565248.

The previous prime is 7728246973. The next prime is 7728246991. The reversal of 7728246981 is 1896428277.

It is a happy number.

It is not a de Polignac number, because 7728246981 - 2³ = 7728246973 is a prime.

It is a super-2 number, since 2×7728246981² (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 (7728246931) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4845 + ... + 124418.

It is an arithmetic number, because the mean of its divisors is an integer number (290154592).

Almost surely, 2^7728246981 is an apocalyptic number.

It is an amenable number.

7728246981 is a deficient number, since it is larger than the sum of its proper divisors (6199173435).

7728246981 is a wasteful number, since it uses less digits than its factorization.

7728246981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129362 (or 129359 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 7728246981 is about 87910.4486451980. The cubic root of 7728246981 is about 1977.0925409711.

The spelling of 7728246981 in words is "seven billion, seven hundred twenty-eight million, two hundred forty-six thousand, nine hundred eighty-one".