247717990 has 32 divisors (see below), whose sum is σ = 488345760. Its totient is φ = 89912064.

The previous prime is 247717963. The next prime is 247718017. The reversal of 247717990 is 99717742.

247717990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (247717963) and next prime (247718017).

It is a super-2 number, since 2×247717990² = 122728405139280200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247717990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8479 + ... + 23818.

It is an arithmetic number, because the mean of its divisors is an integer number (15260805).

Almost surely, 2^247717990 is an apocalyptic number.

247717990 is a deficient number, since it is larger than the sum of its proper divisors (240627770).

247717990 is a wasteful number, since it uses less digits than its factorization.

247717990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32376.

The product of its (nonzero) digits is 222264, while the sum is 46.

The square root of 247717990 is about 15739.0593746895. The cubic root of 247717990 is about 628.0378947882.

It can be divided in two parts, 24771 and 7990, that added together give a square (32761 = 181²).

The spelling of 247717990 in words is "two hundred forty-seven million, seven hundred seventeen thousand, nine hundred ninety".