215243028 has 288 divisors, whose sum is σ = 759100160. Its totient is φ = 51321600.

The previous prime is 215243009. The next prime is 215243047. The reversal of 215243028 is 820342512.

It is an interprime number because it is at equal distance from previous prime (215243009) and next prime (215243047).

It is a super-2 number, since 2×215243028² = 92659122205217568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 215242992 and 215243010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1189098 + ... + 1189278.

Almost surely, 2^215243028 is an apocalyptic number.

215243028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215243028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379550080).

215243028 is an abundant number, since it is smaller than the sum of its proper divisors (543857132).

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

215243028 is a wasteful number, since it uses less digits than its factorization.

215243028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 215243028 is about 14671.1631440728. The cubic root of 215243028 is about 599.2982796342.

The spelling of 215243028 in words is "two hundred fifteen million, two hundred forty-three thousand, twenty-eight".