7681257479 has 4 divisors (see below), whose sum is σ = 8778579984. Its totient is φ = 6583934976.

The previous prime is 7681257473. The next prime is 7681257497. The reversal of 7681257479 is 9747521867.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7681257479 - 2⁸ = 7681257223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7681257473) 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, 548661242 + ... + 548661255.

It is an arithmetic number, because the mean of its divisors is an integer number (2194644996).

Almost surely, 2^7681257479 is an apocalyptic number.

7681257479 is a deficient number, since it is larger than the sum of its proper divisors (1097322505).

7681257479 is a wasteful number, since it uses less digits than its factorization.

7681257479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097322504.

The product of its digits is 5927040, while the sum is 56.

The square root of 7681257479 is about 87642.7833823185. The cubic root of 7681257479 is about 1973.0773344870.

The spelling of 7681257479 in words is "seven billion, six hundred eighty-one million, two hundred fifty-seven thousand, four hundred seventy-nine".