7881738401 has 4 divisors (see below), whose sum is σ = 7881916692. Its totient is φ = 7881560112.

The previous prime is 7881738379. The next prime is 7881738481. The reversal of 7881738401 is 1048371887.

7881738401 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 a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5347119376 + 2534619025 = 73124^2 + 50345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7881738401 is a prime.

It is a super-3 number, since 3×7881738401³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7881738481) 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, 32471 + ... + 129683.

It is an arithmetic number, because the mean of its divisors is an integer number (1970479173).

Almost surely, 2^7881738401 is an apocalyptic number.

It is an amenable number.

7881738401 is a deficient number, since it is larger than the sum of its proper divisors (178291).

7881738401 is an equidigital number, since it uses as much as digits as its factorization.

7881738401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178290.

The product of its (nonzero) digits is 301056, while the sum is 47.

The square root of 7881738401 is about 88779.1552167512. The cubic root of 7881738401 is about 1990.0959021314.

The spelling of 7881738401 in words is "seven billion, eight hundred eighty-one million, seven hundred thirty-eight thousand, four hundred one".