67907421 has 6 divisors (see below), whose sum is σ = 98088510. Its totient is φ = 45271608.

The previous prime is 67907417. The next prime is 67907467. The reversal of 67907421 is 12470976.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66243321 + 1664100 = 8139^2 + 1290^2 .

It is not a de Polignac number, because 67907421 - 2² = 67907417 is a prime.

It is a super-2 number, since 2×67907421² = 9222835653742482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67907471) 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 5 ways as a sum of consecutive naturals, for example, 3772626 + ... + 3772643.

It is an arithmetic number, because the mean of its divisors is an integer number (16348085).

Almost surely, 2^67907421 is an apocalyptic number.

It is an amenable number.

67907421 is a deficient number, since it is larger than the sum of its proper divisors (30181089).

67907421 is a wasteful number, since it uses less digits than its factorization.

67907421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7545275 (or 7545272 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 67907421 is about 8240.5959129179. The cubic root of 67907421 is about 407.9801929543.

The spelling of 67907421 in words is "sixty-seven million, nine hundred seven thousand, four hundred twenty-one".