66727431 has 12 divisors (see below), whose sum is σ = 102053952. Its totient is φ = 41868096.

The previous prime is 66727403. The next prime is 66727501. The reversal of 66727431 is 13472766.

It is not a de Polignac number, because 66727431 - 2⁵ = 66727399 is a prime.

It is a super-2 number, since 2×66727431² = 8905100095719522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66727831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217911 + ... + 218216.

It is an arithmetic number, because the mean of its divisors is an integer number (8504496).

Almost surely, 2^66727431 is an apocalyptic number.

66727431 is a deficient number, since it is larger than the sum of its proper divisors (35326521).

66727431 is a wasteful number, since it uses less digits than its factorization.

66727431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436150 (or 436147 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 66727431 is about 8168.6860020446. The cubic root of 66727431 is about 405.6032892781.

The spelling of 66727431 in words is "sixty-six million, seven hundred twenty-seven thousand, four hundred thirty-one".