66727631 has 8 divisors (see below), whose sum is σ = 67411344. Its totient is φ = 66047040.

The previous prime is 66727559. The next prime is 66727667. The reversal of 66727631 is 13672766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66727631 - 2¹⁰ = 66726607 is a prime.

It is a super-2 number, since 2×66727631² = 8905153477744322, which contains 22 as substring.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 77801 + ... + 78653.

It is an arithmetic number, because the mean of its divisors is an integer number (8426418).

Almost surely, 2^66727631 is an apocalyptic number.

66727631 is a deficient number, since it is larger than the sum of its proper divisors (683713).

66727631 is a wasteful number, since it uses less digits than its factorization.

66727631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561.

The product of its digits is 63504, while the sum is 38.

The square root of 66727631 is about 8168.6982439064. The cubic root of 66727631 is about 405.6036945116.

The spelling of 66727631 in words is "sixty-six million, seven hundred twenty-seven thousand, six hundred thirty-one".