78380677 has 2 divisors, whose sum is σ = 78380678. Its totient is φ = 78380676.

The previous prime is 78380651. The next prime is 78380683. The reversal of 78380677 is 77608387.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73719396 + 4661281 = 8586^2 + 2159^2 .

It is an emirp because it is prime and its reverse (77608387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78380677 - 2¹⁵ = 78347909 is a prime.

It is a super-2 number, since 2×78380677² = 12287061053956658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78380977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39190338 + 39190339.

It is an arithmetic number, because the mean of its divisors is an integer number (39190339).

Almost surely, 2^78380677 is an apocalyptic number.

It is an amenable number.

78380677 is a deficient number, since it is larger than the sum of its proper divisors (1).

78380677 is an equidigital number, since it uses as much as digits as its factorization.

78380677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 78380677 is about 8853.2862260293. The cubic root of 78380677 is about 427.9598271462.

The spelling of 78380677 in words is "seventy-eight million, three hundred eighty thousand, six hundred seventy-seven".