78390883 has 2 divisors, whose sum is σ = 78390884. Its totient is φ = 78390882.

The previous prime is 78390853. The next prime is 78390889. The reversal of 78390883 is 38809387.

It is a strong prime.

It is an emirp because it is prime and its reverse (38809387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78390883 - 2²¹ = 76293731 is a prime.

It is a super-2 number, since 2×78390883² = 12290261075039378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78390889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39195441 + 39195442.

It is an arithmetic number, because the mean of its divisors is an integer number (39195442).

Almost surely, 2^78390883 is an apocalyptic number.

78390883 is a deficient number, since it is larger than the sum of its proper divisors (1).

78390883 is an equidigital number, since it uses as much as digits as its factorization.

78390883 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 78390883 is about 8853.8626034065. The cubic root of 78390883 is about 427.9784013178.

The spelling of 78390883 in words is "seventy-eight million, three hundred ninety thousand, eight hundred eighty-three".