78326977 has 2 divisors, whose sum is σ = 78326978. Its totient is φ = 78326976.

The previous prime is 78326971. The next prime is 78326981. The reversal of 78326977 is 77962387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54110736 + 24216241 = 7356^2 + 4921^2 .

It is a cyclic number.

It is not a de Polignac number, because 78326977 - 2⁷ = 78326849 is a prime.

It is a super-2 number, since 2×78326977² = 12270230651917058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78326977.

It is not a weakly prime, because it can be changed into another prime (78326971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39163488 + 39163489.

It is an arithmetic number, because the mean of its divisors is an integer number (39163489).

Almost surely, 2^78326977 is an apocalyptic number.

It is an amenable number.

78326977 is a deficient number, since it is larger than the sum of its proper divisors (1).

78326977 is an equidigital number, since it uses as much as digits as its factorization.

78326977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 78326977 is about 8850.2529342387. The cubic root of 78326977 is about 427.8620705140.

The spelling of 78326977 in words is "seventy-eight million, three hundred twenty-six thousand, nine hundred seventy-seven".