7828408261 has 8 divisors (see below), whose sum is σ = 7918293240. Its totient is φ = 7739030208.

The previous prime is 7828408223. The next prime is 7828408279. The reversal of 7828408261 is 1628048287.

It is a happy number.

7828408261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5401368036 + 2427040225 = 73494^2 + 49265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7828408261 - 2¹¹ = 7828406213 is a prime.

It is a super-2 number, since 2×7828408261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7828408361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95626 + ... + 157483.

It is an arithmetic number, because the mean of its divisors is an integer number (989786655).

Almost surely, 2^7828408261 is an apocalyptic number.

It is an amenable number.

7828408261 is a deficient number, since it is larger than the sum of its proper divisors (89884979).

7828408261 is a wasteful number, since it uses less digits than its factorization.

7828408261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253463.

The product of its (nonzero) digits is 344064, while the sum is 46.

The square root of 7828408261 is about 88478.2925976762. The cubic root of 7828408261 is about 1985.5972173185.

The spelling of 7828408261 in words is "seven billion, eight hundred twenty-eight million, four hundred eight thousand, two hundred sixty-one".