68077421 has 2 divisors, whose sum is σ = 68077422. Its totient is φ = 68077420.

The previous prime is 68077417. The next prime is 68077433. The reversal of 68077421 is 12477086.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57547396 + 10530025 = 7586^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 68077421 - 2² = 68077417 is a prime.

It is a super-2 number, since 2×68077421² = 9269070500022482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68077411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34038710 + 34038711.

It is an arithmetic number, because the mean of its divisors is an integer number (34038711).

Almost surely, 2^68077421 is an apocalyptic number.

It is an amenable number.

68077421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68077421 is an equidigital number, since it uses as much as digits as its factorization.

68077421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 68077421 is about 8250.9042534743. The cubic root of 68077421 is about 408.3203562538.

The spelling of 68077421 in words is "sixty-eight million, seventy-seven thousand, four hundred twenty-one".