213642774 has 48 divisors (see below), whose sum is σ = 493354368. Its totient is φ = 66583296.

The previous prime is 213642761. The next prime is 213642787. The reversal of 213642774 is 477246312.

213642774 is a `hidden beast` number, since 2 + 1 + 3 + 642 + 7 + 7 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (213642761) and next prime (213642787).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45819 + ... + 50265.

It is an arithmetic number, because the mean of its divisors is an integer number (10278216).

Almost surely, 2^213642774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213642774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246677184).

213642774 is an abundant number, since it is smaller than the sum of its proper divisors (279711594).

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

213642774 is a wasteful number, since it uses less digits than its factorization.

213642774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629 (or 4626 counting only the distinct ones).

The product of its digits is 56448, while the sum is 36.

The square root of 213642774 is about 14616.5240053851. The cubic root of 213642774 is about 597.8093951508.

The spelling of 213642774 in words is "two hundred thirteen million, six hundred forty-two thousand, seven hundred seventy-four".