78968381 has 2 divisors, whose sum is σ = 78968382. Its totient is φ = 78968380.

The previous prime is 78968369. The next prime is 78968387. The reversal of 78968381 is 18386987.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47045881 + 31922500 = 6859^2 + 5650^2 .

It is a cyclic number.

It is not a de Polignac number, because 78968381 - 2⁶ = 78968317 is a prime.

It is a super-2 number, since 2×78968381² = 12472010395522322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78968387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39484190 + 39484191.

It is an arithmetic number, because the mean of its divisors is an integer number (39484191).

Almost surely, 2^78968381 is an apocalyptic number.

It is an amenable number.

78968381 is a deficient number, since it is larger than the sum of its proper divisors (1).

78968381 is an equidigital number, since it uses as much as digits as its factorization.

78968381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 78968381 is about 8886.4155315853. The cubic root of 78968381 is about 429.0267894587.

The spelling of 78968381 in words is "seventy-eight million, nine hundred sixty-eight thousand, three hundred eighty-one".