67140407 has 4 divisors (see below), whose sum is σ = 68278440. Its totient is φ = 66002376.

The previous prime is 67140397. The next prime is 67140439. The reversal of 67140407 is 70404176.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 67140407 - 2²⁶ = 31543 is a prime.

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 67140407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67140107) 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, 568928 + ... + 569045.

It is an arithmetic number, because the mean of its divisors is an integer number (17069610).

Almost surely, 2^67140407 is an apocalyptic number.

67140407 is a deficient number, since it is larger than the sum of its proper divisors (1138033).

67140407 is a wasteful number, since it uses less digits than its factorization.

67140407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138032.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 67140407 is about 8193.9250057588. The cubic root of 67140407 is about 406.4383283977.

The spelling of 67140407 in words is "sixty-seven million, one hundred forty thousand, four hundred seven".