247639085 has 8 divisors (see below), whose sum is σ = 314647416. Its totient is φ = 186457600.

The previous prime is 247639081. The next prime is 247639097. The reversal of 247639085 is 580936742.

247639085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7946761 + 239692324 = 2819^2 + 15482^2 .

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

It is not a de Polignac number, because 247639085 - 2² = 247639081 is a prime.

It is a super-2 number, since 2×247639085² = 122650232839274450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247639081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1456616 + ... + 1456785.

It is an arithmetic number, because the mean of its divisors is an integer number (39330927).

Almost surely, 2^247639085 is an apocalyptic number.

It is an amenable number.

247639085 is a deficient number, since it is larger than the sum of its proper divisors (67008331).

247639085 is a wasteful number, since it uses less digits than its factorization.

247639085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913423.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 247639085 is about 15736.5525131777. The cubic root of 247639085 is about 627.9712052534.

The spelling of 247639085 in words is "two hundred forty-seven million, six hundred thirty-nine thousand, eighty-five".