78669079 has 2 divisors, whose sum is σ = 78669080. Its totient is φ = 78669078.

The previous prime is 78669053. The next prime is 78669091. The reversal of 78669079 is 97096687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78669079 - 2¹⁷ = 78538007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78669379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39334539 + 39334540.

It is an arithmetic number, because the mean of its divisors is an integer number (39334540).

Almost surely, 2^78669079 is an apocalyptic number.

78669079 is a deficient number, since it is larger than the sum of its proper divisors (1).

78669079 is an equidigital number, since it uses as much as digits as its factorization.

78669079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The square root of 78669079 is about 8869.5591209485. The cubic root of 78669079 is about 428.4840779489.

It can be divided in two parts, 786690 and 79, that added together give a square (786769 = 887²).

The spelling of 78669079 in words is "seventy-eight million, six hundred sixty-nine thousand, seventy-nine".