78025819 has 2 divisors, whose sum is σ = 78025820. Its totient is φ = 78025818.

The previous prime is 78025811. The next prime is 78025823. The reversal of 78025819 is 91852087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78025819 - 2³ = 78025811 is a prime.

It is a super-2 number, since 2×78025819² = 12176056861241522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78025811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39012909 + 39012910.

It is an arithmetic number, because the mean of its divisors is an integer number (39012910).

Almost surely, 2^78025819 is an apocalyptic number.

78025819 is a deficient number, since it is larger than the sum of its proper divisors (1).

78025819 is an equidigital number, since it uses as much as digits as its factorization.

78025819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 78025819 is about 8833.2224584237. Note that the first 3 decimals coincide. The cubic root of 78025819 is about 427.3130064624.

The spelling of 78025819 in words is "seventy-eight million, twenty-five thousand, eight hundred nineteen".