216380540 has 48 divisors (see below), whose sum is σ = 461547072. Its totient is φ = 85203456.

The previous prime is 216380537. The next prime is 216380543. The reversal of 216380540 is 45083612.

It is an interprime number because it is at equal distance from previous prime (216380537) and next prime (216380543).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216380543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429929 + ... + 430431.

It is an arithmetic number, because the mean of its divisors is an integer number (9615564).

Almost surely, 2^216380540 is an apocalyptic number.

216380540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216380540 is an abundant number, since it is smaller than the sum of its proper divisors (245166532).

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

216380540 is a wasteful number, since it uses less digits than its factorization.

216380540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 216380540 is about 14709.8789933840. The cubic root of 216380540 is about 600.3521451344.

The spelling of 216380540 in words is "two hundred sixteen million, three hundred eighty thousand, five hundred forty".