78290077 has 2 divisors, whose sum is σ = 78290078. Its totient is φ = 78290076.

The previous prime is 78290071. The next prime is 78290087. The reversal of 78290077 is 77009287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45239076 + 33051001 = 6726^2 + 5749^2 .

It is an emirp because it is prime and its reverse (77009287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78290077 - 2⁷ = 78289949 is a prime.

It is a super-2 number, since 2×78290077² = 12258672313331858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78290071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39145038 + 39145039.

It is an arithmetic number, because the mean of its divisors is an integer number (39145039).

Almost surely, 2^78290077 is an apocalyptic number.

It is an amenable number.

78290077 is a deficient number, since it is larger than the sum of its proper divisors (1).

78290077 is an equidigital number, since it uses as much as digits as its factorization.

78290077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 78290077 is about 8848.1680024737. The cubic root of 78290077 is about 427.7948710598.

The spelling of 78290077 in words is "seventy-eight million, two hundred ninety thousand, seventy-seven".