216231626 has 32 divisors (see below), whose sum is σ = 365592528. Its totient is φ = 95247360.

The previous prime is 216231623. The next prime is 216231661. The reversal of 216231626 is 626132612.

It can be written as a sum of positive squares in 8 ways, for example, as 196420225 + 19811401 = 14015^2 + 4451^2 .

It is a super-2 number, since 2×216231626² = 93512232165207752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216231623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48866 + ... + 53106.

Almost surely, 2^216231626 is an apocalyptic number.

216231626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216231626 is a deficient number, since it is larger than the sum of its proper divisors (149360902).

216231626 is a wasteful number, since it uses less digits than its factorization.

216231626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346.

The product of its digits is 5184, while the sum is 29.

The square root of 216231626 is about 14704.8164218395. The cubic root of 216231626 is about 600.2143919029.

The spelling of 216231626 in words is "two hundred sixteen million, two hundred thirty-one thousand, six hundred twenty-six".