67997631 has 8 divisors (see below), whose sum is σ = 97637680. Its totient is φ = 41844672.

The previous prime is 67997609. The next prime is 67997641. The reversal of 67997631 is 13679976.

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

It is not a de Polignac number, because 67997631 - 2⁹ = 67997119 is a prime.

It is a super-2 number, since 2×67997631² = 9247355643224322, 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 (67997641) 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, 871726 + ... + 871803.

It is an arithmetic number, because the mean of its divisors is an integer number (12204710).

Almost surely, 2^67997631 is an apocalyptic number.

67997631 is a deficient number, since it is larger than the sum of its proper divisors (29640049).

67997631 is a wasteful number, since it uses less digits than its factorization.

67997631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743545.

The product of its digits is 428652, while the sum is 48.

The square root of 67997631 is about 8246.0676082603. The cubic root of 67997631 is about 408.1607702147.

The spelling of 67997631 in words is "sixty-seven million, nine hundred ninety-seven thousand, six hundred thirty-one".