216040520 has 16 divisors (see below), whose sum is σ = 486091260. Its totient is φ = 86416192.

The previous prime is 216040511. The next prime is 216040523. The reversal of 216040520 is 25040612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 202834564 + 13205956 = 14242^2 + 3634^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 216040492 and 216040501.

It is not an unprimeable number, because it can be changed into a prime (216040523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2700467 + ... + 2700546.

Almost surely, 2^216040520 is an apocalyptic number.

216040520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216040520 is an abundant number, since it is smaller than the sum of its proper divisors (270050740).

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

216040520 is a wasteful number, since it uses less digits than its factorization.

216040520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5401024 (or 5401020 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 216040520 is about 14698.3169104493. The cubic root of 216040520 is about 600.0375161727.

The spelling of 216040520 in words is "two hundred sixteen million, forty thousand, five hundred twenty".