217074492 has 60 divisors (see below), whose sum is σ = 580709976. Its totient is φ = 70670880.

The previous prime is 217074491. The next prime is 217074499. The reversal of 217074492 is 294470712.

217074492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217074491) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6142 + ... + 21722.

Almost surely, 2^217074492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217074492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290354988).

217074492 is an abundant number, since it is smaller than the sum of its proper divisors (363635484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217074492 is a wasteful number, since it uses less digits than its factorization.

217074492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15640 (or 15629 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 217074492 is about 14733.4480689348. The cubic root of 217074492 is about 600.9932548341.

The spelling of 217074492 in words is "two hundred seventeen million, seventy-four thousand, four hundred ninety-two".