247161864 has 32 divisors (see below), whose sum is σ = 644771520. Its totient is φ = 78805056.

The previous prime is 247161857. The next prime is 247161869. The reversal of 247161864 is 468161742.

It is a super-2 number, since 2×247161864² = 122177974031908992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247161869) 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, 223327 + ... + 224430.

It is an arithmetic number, because the mean of its divisors is an integer number (20149110).

Almost surely, 2^247161864 is an apocalyptic number.

247161864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

247161864 is an abundant number, since it is smaller than the sum of its proper divisors (397609656).

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

247161864 is a wasteful number, since it uses less digits than its factorization.

247161864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447789 (or 447785 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 247161864 is about 15721.3823819663. The cubic root of 247161864 is about 627.5675617059.

The spelling of 247161864 in words is "two hundred forty-seven million, one hundred sixty-one thousand, eight hundred sixty-four".