215057628 has 36 divisors (see below), whose sum is σ = 556880688. Its totient is φ = 69936960.

The previous prime is 215057627. The next prime is 215057641. The reversal of 215057628 is 826750512.

It is a happy number.

215057628 is a `hidden beast` number, since 21 + 5 + 0 + 5 + 7 + 628 = 666.

215057628 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 215057592 and 215057601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215057621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71376 + ... + 74327.

It is an arithmetic number, because the mean of its divisors is an integer number (15468908).

Almost surely, 2^215057628 is an apocalyptic number.

It is an amenable number.

215057628 is an abundant number, since it is smaller than the sum of its proper divisors (341823060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215057628 is a wasteful number, since it uses less digits than its factorization.

215057628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145754 (or 145749 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 215057628 is about 14664.8432654427. The cubic root of 215057628 is about 599.1261612944.

The spelling of 215057628 in words is "two hundred fifteen million, fifty-seven thousand, six hundred twenty-eight".