78429077 has 2 divisors, whose sum is σ = 78429078. Its totient is φ = 78429076.

The previous prime is 78429073. The next prime is 78429089. The reversal of 78429077 is 77092487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58277956 + 20151121 = 7634^2 + 4489^2 .

It is an emirp because it is prime and its reverse (77092487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78429077 - 2² = 78429073 is a prime.

It is a super-2 number, since 2×78429077² = 12302240238143858, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78429073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39214538 + 39214539.

It is an arithmetic number, because the mean of its divisors is an integer number (39214539).

Almost surely, 2^78429077 is an apocalyptic number.

It is an amenable number.

78429077 is a deficient number, since it is larger than the sum of its proper divisors (1).

78429077 is an equidigital number, since it uses as much as digits as its factorization.

78429077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 78429077 is about 8856.0192524633. The cubic root of 78429077 is about 428.0478972949.

The spelling of 78429077 in words is "seventy-eight million, four hundred twenty-nine thousand, seventy-seven".