67720847 has 2 divisors, whose sum is σ = 67720848. Its totient is φ = 67720846.

The previous prime is 67720831. The next prime is 67720879. The reversal of 67720847 is 74802776.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67720847 - 2⁴ = 67720831 is a prime.

It is a super-2 number, since 2×67720847² = 9172226236794818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67720897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33860423 + 33860424.

It is an arithmetic number, because the mean of its divisors is an integer number (33860424).

Almost surely, 2^67720847 is an apocalyptic number.

67720847 is a deficient number, since it is larger than the sum of its proper divisors (1).

67720847 is an equidigital number, since it uses as much as digits as its factorization.

67720847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 67720847 is about 8229.2677073966. The cubic root of 67720847 is about 407.6062116660.

The spelling of 67720847 in words is "sixty-seven million, seven hundred twenty thousand, eight hundred forty-seven".