213236728 has 8 divisors (see below), whose sum is σ = 399818880. Its totient is φ = 106618360.

The previous prime is 213236701. The next prime is 213236747. The reversal of 213236728 is 827632312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 213236693 and 213236702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13327288 + ... + 13327303.

It is an arithmetic number, because the mean of its divisors is an integer number (49977360).

Almost surely, 2^213236728 is an apocalyptic number.

It is an amenable number.

213236728 is a deficient number, since it is larger than the sum of its proper divisors (186582152).

213236728 is a wasteful number, since it uses less digits than its factorization.

213236728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26654597 (or 26654593 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 213236728 is about 14602.6274348146. The cubic root of 213236728 is about 597.4304260067.

The spelling of 213236728 in words is "two hundred thirteen million, two hundred thirty-six thousand, seven hundred twenty-eight".