78328379 has 2 divisors, whose sum is σ = 78328380. Its totient is φ = 78328378.

The previous prime is 78328357. The next prime is 78328403. The reversal of 78328379 is 97382387.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78328379 - 2¹² = 78324283 is a prime.

It is a super-2 number, since 2×78328379² = 12270669913535282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78328319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39164189 + 39164190.

It is an arithmetic number, because the mean of its divisors is an integer number (39164190).

Almost surely, 2^78328379 is an apocalyptic number.

78328379 is a deficient number, since it is larger than the sum of its proper divisors (1).

78328379 is an equidigital number, since it uses as much as digits as its factorization.

78328379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The square root of 78328379 is about 8850.3321406600. The cubic root of 78328379 is about 427.8646233128.

The spelling of 78328379 in words is "seventy-eight million, three hundred twenty-eight thousand, three hundred seventy-nine".