215490380 has 24 divisors (see below), whose sum is σ = 517177248. Its totient is φ = 73882368.

The previous prime is 215490377. The next prime is 215490389. The reversal of 215490380 is 83094512.

215490380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215490380² = 92872207745088800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215490389) 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, 769469 + ... + 769748.

It is an arithmetic number, because the mean of its divisors is an integer number (21549052).

Almost surely, 2^215490380 is an apocalyptic number.

215490380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215490380 is an abundant number, since it is smaller than the sum of its proper divisors (301686868).

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

215490380 is a wasteful number, since it uses less digits than its factorization.

215490380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539233 (or 1539231 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 215490380 is about 14679.5905937461. The cubic root of 215490380 is about 599.5277580397.

The spelling of 215490380 in words is "two hundred fifteen million, four hundred ninety thousand, three hundred eighty".