247272705 has 48 divisors (see below), whose sum is σ = 448578000. Its totient is φ = 125841408.

The previous prime is 247272703. The next prime is 247272721. The reversal of 247272705 is 507272742.

It can be written as a sum of positive squares in 8 ways, for example, as 29680704 + 217592001 = 5448^2 + 14751^2 .

It is not a de Polignac number, because 247272705 - 2¹ = 247272703 is a prime.

It is a super-2 number, since 2×247272705² = 122287581276034050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 247272705.

It is not an unprimeable number, because it can be changed into a prime (247272703) 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 47 ways as a sum of consecutive naturals, for example, 115081 + ... + 117209.

It is an arithmetic number, because the mean of its divisors is an integer number (9345375).

Almost surely, 2^247272705 is an apocalyptic number.

It is an amenable number.

247272705 is a deficient number, since it is larger than the sum of its proper divisors (201305295).

247272705 is a wasteful number, since it uses less digits than its factorization.

247272705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258 (or 2255 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 36.

The square root of 247272705 is about 15724.9071539389. The cubic root of 247272705 is about 627.6613596451.

The spelling of 247272705 in words is "two hundred forty-seven million, two hundred seventy-two thousand, seven hundred five".