216538794 has 24 divisors (see below), whose sum is σ = 480612132. Its totient is φ = 70418880.

The previous prime is 216538769. The next prime is 216538799. The reversal of 216538794 is 497835612.

216538794 is a `hidden beast` number, since 21 + 6 + 538 + 7 + 94 = 666.

216538794 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 216531225 + 7569 = 14715^2 + 87^2 .

It is not an unprimeable number, because it can be changed into a prime (216538799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145969 + ... + 147444.

Almost surely, 2^216538794 is an apocalyptic number.

216538794 is an abundant number, since it is smaller than the sum of its proper divisors (264073338).

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

216538794 is a wasteful number, since it uses less digits than its factorization.

216538794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293462 (or 293459 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 216538794 is about 14715.2571842968. The cubic root of 216538794 is about 600.4984690996.

The spelling of 216538794 in words is "two hundred sixteen million, five hundred thirty-eight thousand, seven hundred ninety-four".