67421631 has 16 divisors (see below), whose sum is σ = 91555200. Its totient is φ = 44122848.

The previous prime is 67421611. The next prime is 67421657. The reversal of 67421631 is 13612476.

It is not a de Polignac number, because 67421631 - 2⁶ = 67421567 is a prime.

It is a super-2 number, since 2×67421631² = 9091352653400322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67421611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101980 + ... + 102638.

It is an arithmetic number, because the mean of its divisors is an integer number (5722200).

Almost surely, 2^67421631 is an apocalyptic number.

67421631 is a deficient number, since it is larger than the sum of its proper divisors (24133569).

67421631 is a wasteful number, since it uses less digits than its factorization.

67421631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238.

The product of its digits is 6048, while the sum is 30.

The square root of 67421631 is about 8211.0675919761. The cubic root of 67421631 is about 407.0050065085.

The spelling of 67421631 in words is "sixty-seven million, four hundred twenty-one thousand, six hundred thirty-one".