76721363449 has 4 divisors (see below), whose sum is σ = 76741310464. Its totient is φ = 76701416436.

The previous prime is 76721363429. The next prime is 76721363489. The reversal of 76721363449 is 94436312767.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94436312767 = 12893 ⋅7324619.

It is a cyclic number.

It is not a de Polignac number, because 76721363449 - 2⁵ = 76721363417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 76721363396 and 76721363405.

It is not an unprimeable number, because it can be changed into a prime (76721363429) 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, 9967737 + ... + 9975430.

It is an arithmetic number, because the mean of its divisors is an integer number (19185327616).

Almost surely, 2^76721363449 is an apocalyptic number.

It is an amenable number.

76721363449 is a deficient number, since it is larger than the sum of its proper divisors (19947015).

76721363449 is a wasteful number, since it uses less digits than its factorization.

76721363449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19947014.

The product of its digits is 4572288, while the sum is 52.

The spelling of 76721363449 in words is "seventy-six billion, seven hundred twenty-one million, three hundred sixty-three thousand, four hundred forty-nine".