216387250 has 32 divisors (see below), whose sum is σ = 406373760. Its totient is φ = 86278000.

The previous prime is 216387221. The next prime is 216387251. The reversal of 216387250 is 52783612.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (216387251) 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, 88545 + ... + 90955.

It is an arithmetic number, because the mean of its divisors is an integer number (12699180).

Almost surely, 2^216387250 is an apocalyptic number.

216387250 is a deficient number, since it is larger than the sum of its proper divisors (189986510).

216387250 is a wasteful number, since it uses less digits than its factorization.

216387250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787 (or 2777 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 216387250 is about 14710.1070696307. The cubic root of 216387250 is about 600.3583507468.

The spelling of 216387250 in words is "two hundred sixteen million, three hundred eighty-seven thousand, two hundred fifty".