215287868 has 6 divisors (see below), whose sum is σ = 376753776. Its totient is φ = 107643932.

The previous prime is 215287861. The next prime is 215287907. The reversal of 215287868 is 868782512.

It is a super-2 number, since 2×215287868² = 92697732215970848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215287861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26910980 + ... + 26910987.

It is an arithmetic number, because the mean of its divisors is an integer number (62792296).

Almost surely, 2^215287868 is an apocalyptic number.

It is an amenable number.

215287868 is a deficient number, since it is larger than the sum of its proper divisors (161465908).

215287868 is a wasteful number, since it uses less digits than its factorization.

215287868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53821971 (or 53821969 counting only the distinct ones).

The product of its digits is 430080, while the sum is 47.

The square root of 215287868 is about 14672.6912323541. The cubic root of 215287868 is about 599.3398925484.

The spelling of 215287868 in words is "two hundred fifteen million, two hundred eighty-seven thousand, eight hundred sixty-eight".