67297431 has 4 divisors (see below), whose sum is σ = 89729912. Its totient is φ = 44864952.

The previous prime is 67297423. The next prime is 67297453. The reversal of 67297431 is 13479276.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 67297431 - 2³ = 67297423 is a prime.

It is a super-3 number, since 3×67297431³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67297431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67297331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11216236 + ... + 11216241.

It is an arithmetic number, because the mean of its divisors is an integer number (22432478).

Almost surely, 2^67297431 is an apocalyptic number.

67297431 is a deficient number, since it is larger than the sum of its proper divisors (22432481).

67297431 is a wasteful number, since it uses less digits than its factorization.

67297431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22432480.

The product of its digits is 63504, while the sum is 39.

The square root of 67297431 is about 8203.5011428048. The cubic root of 67297431 is about 406.7549329890.

The spelling of 67297431 in words is "sixty-seven million, two hundred ninety-seven thousand, four hundred thirty-one".