216547402 has 4 divisors (see below), whose sum is σ = 324821106. Its totient is φ = 108273700.

The previous prime is 216547399. The next prime is 216547451. The reversal of 216547402 is 204745612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 216354681 + 192721 = 14709^2 + 439^2 .

It is a super-3 number, since 3×216547402³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54136849 + ... + 54136852.

Almost surely, 2^216547402 is an apocalyptic number.

216547402 is a deficient number, since it is larger than the sum of its proper divisors (108273704).

216547402 is a wasteful number, since it uses less digits than its factorization.

216547402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108273703.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 216547402 is about 14715.5496669340. The cubic root of 216547402 is about 600.5064261377.

The spelling of 216547402 in words is "two hundred sixteen million, five hundred forty-seven thousand, four hundred two".