78023429 has 16 divisors (see below), whose sum is σ = 90339840. Its totient is φ = 66683760.

The previous prime is 78023389. The next prime is 78023441. The reversal of 78023429 is 92432087.

78023429 = 112² + 113² + ... + 617².

It is not a de Polignac number, because 78023429 - 2²⁰ = 76974853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78023459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12314 + ... + 17540.

It is an arithmetic number, because the mean of its divisors is an integer number (5646240).

Almost surely, 2^78023429 is an apocalyptic number.

It is an amenable number.

78023429 is a deficient number, since it is larger than the sum of its proper divisors (12316411).

78023429 is a wasteful number, since it uses less digits than its factorization.

78023429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5320.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 78023429 is about 8833.0871726707. The cubic root of 78023429 is about 427.3086434258.

The spelling of 78023429 in words is "seventy-eight million, twenty-three thousand, four hundred twenty-nine".