215257830 has 16 divisors (see below), whose sum is σ = 516618864. Its totient is φ = 57402080.

The previous prime is 215257817. The next prime is 215257849. The reversal of 215257830 is 38752512.

215257830 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 = 215257791 and 215257800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3587601 + ... + 3587660.

It is an arithmetic number, because the mean of its divisors is an integer number (32288679).

Almost surely, 2^215257830 is an apocalyptic number.

215257830 is an abundant number, since it is smaller than the sum of its proper divisors (301361034).

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

215257830 is a wasteful number, since it uses less digits than its factorization.

215257830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7175271.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 215257830 is about 14671.6675943807. The cubic root of 215257830 is about 599.3120169894.

The spelling of 215257830 in words is "two hundred fifteen million, two hundred fifty-seven thousand, eight hundred thirty".