247864945 has 8 divisors (see below), whose sum is σ = 297780840. Its totient is φ = 198063360.

The previous prime is 247864909. The next prime is 247864957. The reversal of 247864945 is 549468742.

It can be written as a sum of positive squares in 4 ways, for example, as 56070144 + 191794801 = 7488^2 + 13849^2 .

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

It is not a de Polignac number, because 247864945 - 2¹⁹ = 247340657 is a prime.

It is a super-2 number, since 2×247864945² = 122874061919706050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23730 + ... + 32539.

It is an arithmetic number, because the mean of its divisors is an integer number (37222605).

Almost surely, 2^247864945 is an apocalyptic number.

It is an amenable number.

247864945 is a deficient number, since it is larger than the sum of its proper divisors (49915895).

247864945 is an equidigital number, since it uses as much as digits as its factorization.

247864945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57155.

The product of its digits is 1935360, while the sum is 49.

The square root of 247864945 is about 15743.7271635404. The cubic root of 247864945 is about 628.1620616070.

The spelling of 247864945 in words is "two hundred forty-seven million, eight hundred sixty-four thousand, nine hundred forty-five".