67540749 has 4 divisors (see below), whose sum is σ = 90054336. Its totient is φ = 45027164.

The previous prime is 67540747. The next prime is 67540751. The reversal of 67540749 is 94704576.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (67540747) and next prime (67540751).

It is a cyclic number.

It is not a de Polignac number, because 67540749 - 2¹ = 67540747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67540749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67540747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11256789 + ... + 11256794.

It is an arithmetic number, because the mean of its divisors is an integer number (22513584).

Almost surely, 2^67540749 is an apocalyptic number.

It is an amenable number.

67540749 is a deficient number, since it is larger than the sum of its proper divisors (22513587).

67540749 is a wasteful number, since it uses less digits than its factorization.

67540749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22513586.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 67540749 is about 8218.3178935838. The cubic root of 67540749 is about 407.2445591951.

The spelling of 67540749 in words is "sixty-seven million, five hundred forty thousand, seven hundred forty-nine".