215428732 has 6 divisors (see below), whose sum is σ = 377000288. Its totient is φ = 107714364.

The previous prime is 215428721. The next prime is 215428747. The reversal of 215428732 is 237824512.

It is a happy number.

It is a super-2 number, since 2×215428732² = 92819077142255648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26928588 + ... + 26928595.

Almost surely, 2^215428732 is an apocalyptic number.

It is an amenable number.

215428732 is a deficient number, since it is larger than the sum of its proper divisors (161571556).

215428732 is a wasteful number, since it uses less digits than its factorization.

215428732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53857187 (or 53857185 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 215428732 is about 14677.4906574659. The cubic root of 215428732 is about 599.4705811450.

The spelling of 215428732 in words is "two hundred fifteen million, four hundred twenty-eight thousand, seven hundred thirty-two".