215688450 has 48 divisors (see below), whose sum is σ = 536903136. Its totient is φ = 57302400.

The previous prime is 215688433. The next prime is 215688461. The reversal of 215688450 is 54886512.

It is a junction number, because it is equal to n+sod(n) for n = 215688399 and 215688408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39910 + ... + 44990.

It is an arithmetic number, because the mean of its divisors is an integer number (11185482).

Almost surely, 2^215688450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215688450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268451568).

215688450 is an abundant number, since it is smaller than the sum of its proper divisors (321214686).

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

215688450 is a wasteful number, since it uses less digits than its factorization.

215688450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5379 (or 5374 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 215688450 is about 14686.3354857500. The cubic root of 215688450 is about 599.7113889728.

The spelling of 215688450 in words is "two hundred fifteen million, six hundred eighty-eight thousand, four hundred fifty".