78375839 has 2 divisors, whose sum is σ = 78375840. Its totient is φ = 78375838.

The previous prime is 78375833. The next prime is 78375853. The reversal of 78375839 is 93857387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78375839 - 2¹⁶ = 78310303 is a prime.

It is a super-2 number, since 2×78375839² = 12285544277907842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78375833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39187919 + 39187920.

It is an arithmetic number, because the mean of its divisors is an integer number (39187920).

Almost surely, 2^78375839 is an apocalyptic number.

78375839 is a deficient number, since it is larger than the sum of its proper divisors (1).

78375839 is an equidigital number, since it uses as much as digits as its factorization.

78375839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The square root of 78375839 is about 8853.0129899374. The cubic root of 78375839 is about 427.9510217777.

The spelling of 78375839 in words is "seventy-eight million, three hundred seventy-five thousand, eight hundred thirty-nine".