217490029748 has 12 divisors (see below), whose sum is σ = 385821354660. Its totient is φ = 107255356992.

The previous prime is 217490029643. The next prime is 217490029759. The reversal of 217490029748 is 847920094712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 73968768784 + 143521260964 = 271972^2 + 378842^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 217490029748.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372414143 + ... + 372414726.

It is an arithmetic number, because the mean of its divisors is an integer number (32151779555).

Almost surely, 2^217490029748 is an apocalyptic number.

It is an amenable number.

217490029748 is a deficient number, since it is larger than the sum of its proper divisors (168331324912).

217490029748 is a wasteful number, since it uses less digits than its factorization.

217490029748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744828946 (or 744828944 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 217490029748 in words is "two hundred seventeen billion, four hundred ninety million, twenty-nine thousand, seven hundred forty-eight".