247664997 has 12 divisors (see below), whose sum is σ = 358092384. Its totient is φ = 164946600.

The previous prime is 247664987. The next prime is 247665001. The reversal of 247664997 is 799466742.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-247664997 is a prime.

It is a super-2 number, since 2×247664997² = 122675901478020018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247664927) 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 11 ways as a sum of consecutive naturals, for example, 3633 + ... + 22550.

It is an arithmetic number, because the mean of its divisors is an integer number (29841032).

Almost surely, 2^247664997 is an apocalyptic number.

It is an amenable number.

247664997 is a deficient number, since it is larger than the sum of its proper divisors (110427387).

247664997 is a wasteful number, since it uses less digits than its factorization.

247664997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27240 (or 27237 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 247664997 is about 15737.3757977625. The cubic root of 247664997 is about 627.9931073188.

The spelling of 247664997 in words is "two hundred forty-seven million, six hundred sixty-four thousand, nine hundred ninety-seven".