78748819 has 2 divisors, whose sum is σ = 78748820. Its totient is φ = 78748818.

The previous prime is 78748807. The next prime is 78748837. The reversal of 78748819 is 91884787.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78748819 is a prime.

It is a super-2 number, since 2×78748819² = 12402752987789522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78748889) 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, 39374409 + 39374410.

It is an arithmetic number, because the mean of its divisors is an integer number (39374410).

Almost surely, 2^78748819 is an apocalyptic number.

78748819 is a deficient number, since it is larger than the sum of its proper divisors (1).

78748819 is an equidigital number, since it uses as much as digits as its factorization.

78748819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 52.

The square root of 78748819 is about 8874.0531325883. The cubic root of 78748819 is about 428.6288014038.

The spelling of 78748819 in words is "seventy-eight million, seven hundred forty-eight thousand, eight hundred nineteen".