67721047 has 8 divisors (see below), whose sum is σ = 71780256. Its totient is φ = 63670272.

The previous prime is 67721021. The next prime is 67721057. The reversal of 67721047 is 74012776.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67721047 - 2¹¹ = 67718999 is a prime.

It is a super-2 number, since 2×67721047² = 9172280413552418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67721057) 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 7 ways as a sum of consecutive naturals, for example, 23223 + ... + 25975.

It is an arithmetic number, because the mean of its divisors is an integer number (8972532).

Almost surely, 2^67721047 is an apocalyptic number.

67721047 is a deficient number, since it is larger than the sum of its proper divisors (4059209).

67721047 is a wasteful number, since it uses less digits than its factorization.

67721047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4217.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 67721047 is about 8229.2798591371. The cubic root of 67721047 is about 407.6066129268.

The spelling of 67721047 in words is "sixty-seven million, seven hundred twenty-one thousand, forty-seven".