213555428 has 24 divisors (see below), whose sum is σ = 398153952. Its totient is φ = 99874944.

The previous prime is 213555427. The next prime is 213555439. The reversal of 213555428 is 824555312.

213555428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (213555427) 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, 1451 + ... + 20717.

It is an arithmetic number, because the mean of its divisors is an integer number (16589748).

Almost surely, 2^213555428 is an apocalyptic number.

It is an amenable number.

213555428 is a deficient number, since it is larger than the sum of its proper divisors (184598524).

213555428 is a wasteful number, since it uses less digits than its factorization.

213555428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19451 (or 19449 counting only the distinct ones).

The product of its digits is 48000, while the sum is 35.

The square root of 213555428 is about 14613.5357802279. The cubic root of 213555428 is about 597.7279143123.

The spelling of 213555428 in words is "two hundred thirteen million, five hundred fifty-five thousand, four hundred twenty-eight".