7646278249 has 3 divisors (see below), whose sum is σ = 7646365693. Its totient is φ = 7646190806.

The previous prime is 7646278229. The next prime is 7646278303. The reversal of 7646278249 is 9428726467.

The square root of 7646278249 is 87443.

It is a perfect power (a square), and thus also a powerful number.

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 is not a de Polignac number, because 7646278249 - 2⁷ = 7646278121 is a prime.

It is a super-2 number, since 2×7646278249² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7646278249.

It is not an unprimeable number, because it can be changed into a prime (7646278219) 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 2 ways as a sum of consecutive naturals, for example, 43722 + ... + 131164.

Almost surely, 2^7646278249 is an apocalyptic number.

7646278249 is the 87443-rd square number.

7646278249 is the 43722-nd centered octagonal number.

It is an amenable number.

7646278249 is a deficient number, since it is larger than the sum of its proper divisors (87444).

7646278249 is an frugal number, since it uses more digits than its factorization.

7646278249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174886 (or 87443 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 55.

The cubic root of 7646278249 is about 1970.0777494287.

The spelling of 7646278249 in words is "seven billion, six hundred forty-six million, two hundred seventy-eight thousand, two hundred forty-nine".