7827778361 has 8 divisors (see below), whose sum is σ = 8461025664. Its totient is φ = 7198975440.

The previous prime is 7827778337. The next prime is 7827778379. The reversal of 7827778361 is 1638777287.

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 7827778361 - 2¹⁰ = 7827777337 is a prime.

It is a super-2 number, since 2×7827778361² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7827778297 and 7827778306.

It is not an unprimeable number, because it can be changed into a prime (7827778381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1107431 + ... + 1114476.

It is an arithmetic number, because the mean of its divisors is an integer number (1057628208).

Almost surely, 2^7827778361 is an apocalyptic number.

It is an amenable number.

7827778361 is a deficient number, since it is larger than the sum of its proper divisors (633247303).

7827778361 is a wasteful number, since it uses less digits than its factorization.

7827778361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222191.

The product of its digits is 5531904, while the sum is 56.

The square root of 7827778361 is about 88474.7328958952. The cubic root of 7827778361 is about 1985.5439599515.

The spelling of 7827778361 in words is "seven billion, eight hundred twenty-seven million, seven hundred seventy-eight thousand, three hundred sixty-one".