67720243 has 2 divisors, whose sum is σ = 67720244. Its totient is φ = 67720242.

The previous prime is 67720217. The next prime is 67720321. The reversal of 67720243 is 34202776.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67720243 - 2²¹ = 65623091 is a prime.

It is not a weakly prime, because it can be changed into another prime (67720343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33860121 + 33860122.

It is an arithmetic number, because the mean of its divisors is an integer number (33860122).

Almost surely, 2^67720243 is an apocalyptic number.

67720243 is a deficient number, since it is larger than the sum of its proper divisors (1).

67720243 is an equidigital number, since it uses as much as digits as its factorization.

67720243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 67720243 is about 8229.2310090312. The cubic root of 67720243 is about 407.6049998536.

The spelling of 67720243 in words is "sixty-seven million, seven hundred twenty thousand, two hundred forty-three".