247720005 has 192 divisors, whose sum is σ = 553029120. Its totient is φ = 104011776.

The previous prime is 247719949. The next prime is 247720007. The reversal of 247720005 is 500027742.

247720005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 247720005 - 2⁷ = 247719877 is a prime.

It is a super-2 number, since 2×247720005² = 122730401754400050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247720007) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 10770424 + ... + 10770446.

It is an arithmetic number, because the mean of its divisors is an integer number (2880360).

Almost surely, 2^247720005 is an apocalyptic number.

It is an amenable number.

247720005 is an abundant number, since it is smaller than the sum of its proper divisors (305309115).

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

247720005 is a wasteful number, since it uses less digits than its factorization.

247720005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 247720005 is about 15739.1233872792. The cubic root of 247720005 is about 628.0395976560.

Adding to 247720005 its reverse (500027742), we get a palindrome (747747747).

The spelling of 247720005 in words is "two hundred forty-seven million, seven hundred twenty thousand, five".