216261630 has 64 divisors (see below), whose sum is σ = 621069120. Its totient is φ = 53232768.

The previous prime is 216261623. The next prime is 216261637. The reversal of 216261630 is 36162612.

216261630 is a `hidden beast` number, since 2 + 1 + 6 + 26 + 1 + 630 = 666.

It is an interprime number because it is at equal distance from previous prime (216261623) and next prime (216261637).

It is a super-2 number, since 2×216261630² = 93538185220513800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216261594 and 216261603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216261637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27297 + ... + 34316.

It is an arithmetic number, because the mean of its divisors is an integer number (9704205).

Almost surely, 2^216261630 is an apocalyptic number.

216261630 is an abundant number, since it is smaller than the sum of its proper divisors (404807490).

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

216261630 is a wasteful number, since it uses less digits than its factorization.

216261630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61642 (or 61636 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 216261630 is about 14705.8365963994. The cubic root of 216261630 is about 600.2421522573.

The spelling of 216261630 in words is "two hundred sixteen million, two hundred sixty-one thousand, six hundred thirty".