213771768 has 32 divisors (see below), whose sum is σ = 610776960. Its totient is φ = 61077600.

The previous prime is 213771763. The next prime is 213771773. The reversal of 213771768 is 867177312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (213771763) and next prime (213771773).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213771763) 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, 636058 + ... + 636393.

It is an arithmetic number, because the mean of its divisors is an integer number (19086780).

Almost surely, 2^213771768 is an apocalyptic number.

213771768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

213771768 is an abundant number, since it is smaller than the sum of its proper divisors (397005192).

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

213771768 is a wasteful number, since it uses less digits than its factorization.

213771768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272467 (or 1272463 counting only the distinct ones).

The product of its digits is 98784, while the sum is 42.

The square root of 213771768 is about 14620.9359481533. The cubic root of 213771768 is about 597.9296867773.

The spelling of 213771768 in words is "two hundred thirteen million, seven hundred seventy-one thousand, seven hundred sixty-eight".