788478657 has 4 divisors (see below), whose sum is σ = 1051304880. Its totient is φ = 525652436.

The previous prime is 788478637. The next prime is 788478661. The reversal of 788478657 is 756874887.

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.

It is a cyclic number.

It is not a de Polignac number, because 788478657 - 2¹⁶ = 788413121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 788478657.

It is not an unprimeable number, because it can be changed into a prime (788478637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131413107 + ... + 131413112.

It is an arithmetic number, because the mean of its divisors is an integer number (262826220).

Almost surely, 2^788478657 is an apocalyptic number.

It is an amenable number.

788478657 is a deficient number, since it is larger than the sum of its proper divisors (262826223).

788478657 is a wasteful number, since it uses less digits than its factorization.

788478657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262826222.

The product of its digits is 21073920, while the sum is 60.

The square root of 788478657 is about 28079.8621257299. The cubic root of 788478657 is about 923.8397557142.

The spelling of 788478657 in words is "seven hundred eighty-eight million, four hundred seventy-eight thousand, six hundred fifty-seven".