213087428 has 12 divisors (see below), whose sum is σ = 384932352. Its totient is φ = 103106760.

The previous prime is 213087419. The next prime is 213087439. The reversal of 213087428 is 824780312.

213087428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 859100 + ... + 859347.

It is an arithmetic number, because the mean of its divisors is an integer number (32077696).

Almost surely, 2^213087428 is an apocalyptic number.

It is an amenable number.

213087428 is a deficient number, since it is larger than the sum of its proper divisors (171844924).

213087428 is a wasteful number, since it uses less digits than its factorization.

213087428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718482 (or 1718480 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 213087428 is about 14597.5144459596. The cubic root of 213087428 is about 597.2909609955.

The spelling of 213087428 in words is "two hundred thirteen million, eighty-seven thousand, four hundred twenty-eight".