247646742 has 32 divisors (see below), whose sum is σ = 568276992. Its totient is φ = 70477824.

The previous prime is 247646717. The next prime is 247646743.

It is a happy number.

247646742 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×247646742² = 122657817646429128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 247646694 and 247646703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247646743) 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 15 ways as a sum of consecutive naturals, for example, 678 + ... + 22265.

It is an arithmetic number, because the mean of its divisors is an integer number (17758656).

Almost surely, 2^247646742 is an apocalyptic number.

247646742 is an abundant number, since it is smaller than the sum of its proper divisors (320630250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247646742 is a wasteful number, since it uses less digits than its factorization.

247646742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23212.

The product of its digits is 451584, while the sum is 42.

The square root of 247646742 is about 15736.7957983828. The cubic root of 247646742 is about 627.9776774761.

The spelling of 247646742 in words is "two hundred forty-seven million, six hundred forty-six thousand, seven hundred forty-two".