67720007 has 4 divisors (see below), whose sum is σ = 67834800. Its totient is φ = 67605216.

The previous prime is 67720001. The next prime is 67720039. The reversal of 67720007 is 70002776.

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 67720007 - 2¹⁶ = 67654471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67720001) 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, 56507 + ... + 57692.

It is an arithmetic number, because the mean of its divisors is an integer number (16958700).

Almost surely, 2^67720007 is an apocalyptic number.

67720007 is a deficient number, since it is larger than the sum of its proper divisors (114793).

67720007 is a wasteful number, since it uses less digits than its factorization.

67720007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114792.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 67720007 is about 8229.2166698903. The cubic root of 67720007 is about 407.6045263620.

The spelling of 67720007 in words is "sixty-seven million, seven hundred twenty thousand, seven".