215801380 has 24 divisors (see below), whose sum is σ = 453458880. Its totient is φ = 86268000.

The previous prime is 215801357. The next prime is 215801389. The reversal of 215801380 is 83108512.

It is a super-3 number, since 3×215801380³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (215801389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63361 + ... + 66679.

It is an arithmetic number, because the mean of its divisors is an integer number (18894120).

Almost surely, 2^215801380 is an apocalyptic number.

215801380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215801380 is an abundant number, since it is smaller than the sum of its proper divisors (237657500).

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

215801380 is a wasteful number, since it uses less digits than its factorization.

215801380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6579 (or 6577 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 215801380 is about 14690.1797129919. The cubic root of 215801380 is about 599.8160361939.

Adding to 215801380 its reverse (83108512), we get a palindrome (298909892).

The spelling of 215801380 in words is "two hundred fifteen million, eight hundred one thousand, three hundred eighty".