215720047 has 8 divisors (see below), whose sum is σ = 218504880. Its totient is φ = 212950080.

The previous prime is 215720023. The next prime is 215720093. The reversal of 215720047 is 740027512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215720047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215719997 and 215720024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215520047) 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, 27108 + ... + 34150.

It is an arithmetic number, because the mean of its divisors is an integer number (27313110).

Almost surely, 2^215720047 is an apocalyptic number.

215720047 is a deficient number, since it is larger than the sum of its proper divisors (2784833).

215720047 is a wasteful number, since it uses less digits than its factorization.

215720047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7433.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 215720047 is about 14687.4111741995. The cubic root of 215720047 is about 599.7406721906.

Adding to 215720047 its reverse (740027512), we get a palindrome (955747559).

The spelling of 215720047 in words is "two hundred fifteen million, seven hundred twenty thousand, forty-seven".