215550428 has 12 divisors (see below), whose sum is σ = 377600832. Its totient is φ = 107664480.

The previous prime is 215550373. The next prime is 215550437. The reversal of 215550428 is 824055512.

215550428 is nontrivially palindromic in base 16.

215550428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 215550394 and 215550403.

It is a congruent number.

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, 23225 + ... + 31152.

It is an arithmetic number, because the mean of its divisors is an integer number (31466736).

Almost surely, 2^215550428 is an apocalyptic number.

It is an amenable number.

215550428 is a deficient number, since it is larger than the sum of its proper divisors (162050404).

215550428 is a wasteful number, since it uses less digits than its factorization.

215550428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55372 (or 55370 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 215550428 is about 14681.6357399303. The cubic root of 215550428 is about 599.5834404935.

The spelling of 215550428 in words is "two hundred fifteen million, five hundred fifty thousand, four hundred twenty-eight".