215032640 has 56 divisors (see below), whose sum is σ = 513722112. Its totient is φ = 85731840.

The previous prime is 215032621. The next prime is 215032673. The reversal of 215032640 is 46230512.

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, 116525 + ... + 118355.

Almost surely, 2^215032640 is an apocalyptic number.

215032640 is a gapful number since it is divisible by the number (20) 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 215032640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256861056).

215032640 is an abundant number, since it is smaller than the sum of its proper divisors (298689472).

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

215032640 is a wasteful number, since it uses less digits than its factorization.

215032640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215 (or 2205 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 215032640 is about 14663.9912711376. The cubic root of 215032640 is about 599.1029558176.

The spelling of 215032640 in words is "two hundred fifteen million, thirty-two thousand, six hundred forty".