215440080 has 160 divisors (see below), whose sum is σ = 719953920. Its totient is φ = 53137920.

The previous prime is 215440079. The next prime is 215440109. The reversal of 215440080 is 80044512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 215440080.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170491 + ... + 171749.

It is an arithmetic number, because the mean of its divisors is an integer number (4499712).

Almost surely, 2^215440080 is an apocalyptic number.

215440080 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 215440080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359976960).

215440080 is an abundant number, since it is smaller than the sum of its proper divisors (504513840).

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

215440080 is a wasteful number, since it uses less digits than its factorization.

215440080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329 (or 1323 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 215440080 is about 14677.8772307170. The cubic root of 215440080 is about 599.4811069349.

Adding to 215440080 its reverse (80044512), we get a palindrome (295484592).

The spelling of 215440080 in words is "two hundred fifteen million, four hundred forty thousand, eighty".