247789478 has 8 divisors (see below), whose sum is σ = 380328168. Its totient is φ = 121013424.

The previous prime is 247789471. The next prime is 247789483. The reversal of 247789478 is 874987742.

It is a happy number.

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

It is a super-2 number, since 2×247789478² = 122799250815024968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247789471) 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 3 ways as a sum of consecutive naturals, for example, 1440551 + ... + 1440722.

It is an arithmetic number, because the mean of its divisors is an integer number (47541021).

Almost surely, 2^247789478 is an apocalyptic number.

247789478 is a deficient number, since it is larger than the sum of its proper divisors (132538690).

247789478 is a wasteful number, since it uses less digits than its factorization.

247789478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881318.

The product of its digits is 6322176, while the sum is 56.

The square root of 247789478 is about 15741.3302487433. The cubic root of 247789478 is about 628.0983033397.

The spelling of 247789478 in words is "two hundred forty-seven million, seven hundred eighty-nine thousand, four hundred seventy-eight".