77728479 has 8 divisors (see below), whose sum is σ = 103713792. Its totient is φ = 51781080.

The previous prime is 77728397. The next prime is 77728513. The reversal of 77728479 is 97482777.

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

It is not a de Polignac number, because 77728479 - 2²⁰ = 76679903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77728279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4287 + ... + 13184.

It is an arithmetic number, because the mean of its divisors is an integer number (12964224).

Almost surely, 2^77728479 is an apocalyptic number.

77728479 is a deficient number, since it is larger than the sum of its proper divisors (25985313).

77728479 is a wasteful number, since it uses less digits than its factorization.

77728479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18957.

The product of its digits is 1382976, while the sum is 51.

The square root of 77728479 is about 8816.3756158639. The cubic root of 77728479 is about 426.7695154757.

The spelling of 77728479 in words is "seventy-seven million, seven hundred twenty-eight thousand, four hundred seventy-nine".