215183428 has 6 divisors (see below), whose sum is σ = 376571006. Its totient is φ = 107591712.

The previous prime is 215183413. The next prime is 215183459. The reversal of 215183428 is 824381512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 157301764 + 57881664 = 12542^2 + 7608^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215183393 and 215183402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26897925 + ... + 26897932.

Almost surely, 2^215183428 is an apocalyptic number.

It is an amenable number.

215183428 is a deficient number, since it is larger than the sum of its proper divisors (161387578).

215183428 is a wasteful number, since it uses less digits than its factorization.

215183428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53795861 (or 53795859 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 215183428 is about 14669.1318079837. The cubic root of 215183428 is about 599.2429600340.

The spelling of 215183428 in words is "two hundred fifteen million, one hundred eighty-three thousand, four hundred twenty-eight".