216649072 has 20 divisors (see below), whose sum is σ = 420816816. Its totient is φ = 108051200.

The previous prime is 216649057. The next prime is 216649087. The reversal of 216649072 is 270946612.

It is an interprime number because it is at equal distance from previous prime (216649057) and next prime (216649087).

It is a super-2 number, since 2×216649072² = 93873640796922368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10468 + ... + 23299.

Almost surely, 2^216649072 is an apocalyptic number.

It is an amenable number.

216649072 is a deficient number, since it is larger than the sum of its proper divisors (204167744).

216649072 is a wasteful number, since it uses less digits than its factorization.

216649072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34176 (or 34170 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 216649072 is about 14719.0037706361. The cubic root of 216649072 is about 600.6003916087.

The spelling of 216649072 in words is "two hundred sixteen million, six hundred forty-nine thousand, seventy-two".