7478768881 has 4 divisors (see below), whose sum is σ = 7479064692. Its totient is φ = 7478473072.

The previous prime is 7478768863. The next prime is 7478768887. The reversal of 7478768881 is 1888678747.

7478768881 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1888678747 = 599 ⋅3153053.

It can be written as a sum of positive squares in 2 ways, for example, as 6590192400 + 888576481 = 81180^2 + 29809^2 .

It is a cyclic number.

It is not a de Polignac number, because 7478768881 - 2¹⁹ = 7478244593 is a prime.

It is a super-2 number, since 2×7478768881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7478768887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106030 + ... + 161863.

It is an arithmetic number, because the mean of its divisors is an integer number (1869766173).

Almost surely, 2^7478768881 is an apocalyptic number.

It is an amenable number.

7478768881 is a deficient number, since it is larger than the sum of its proper divisors (295811).

7478768881 is a wasteful number, since it uses less digits than its factorization.

7478768881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295810.

The product of its digits is 33718272, while the sum is 64.

The square root of 7478768881 is about 86479.8755838605. The cubic root of 7478768881 is about 1955.5850300512.

The spelling of 7478768881 in words is "seven billion, four hundred seventy-eight million, seven hundred sixty-eight thousand, eight hundred eighty-one".