216915672 has 32 divisors (see below), whose sum is σ = 549158400. Its totient is φ = 71389344.

The previous prime is 216915667. The next prime is 216915689. The reversal of 216915672 is 276519612.

It is a super-3 number, since 3×216915672³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216915672.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55308 + ... + 59099.

It is an arithmetic number, because the mean of its divisors is an integer number (17161200).

Almost surely, 2^216915672 is an apocalyptic number.

It is an amenable number.

216915672 is an abundant number, since it is smaller than the sum of its proper divisors (332242728).

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

216915672 is a wasteful number, since it uses less digits than its factorization.

216915672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114495 (or 114491 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 216915672 is about 14728.0573057006. The cubic root of 216915672 is about 600.8466491911.

The spelling of 216915672 in words is "two hundred sixteen million, nine hundred fifteen thousand, six hundred seventy-two".