78444029 has 4 divisors (see below), whose sum is σ = 80357340. Its totient is φ = 76530720.

The previous prime is 78443999. The next prime is 78444059. The reversal of 78444029 is 92044487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92044487 = 31 ⋅2969177.

It is an interprime number because it is at equal distance from previous prime (78443999) and next prime (78444059).

It can be written as a sum of positive squares in 2 ways, for example, as 27321529 + 51122500 = 5227^2 + 7150^2 .

It is a cyclic number.

It is not a de Polignac number, because 78444029 - 2¹⁶ = 78378493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78443983 and 78444001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78444059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956594 + ... + 956675.

It is an arithmetic number, because the mean of its divisors is an integer number (20089335).

Almost surely, 2^78444029 is an apocalyptic number.

It is an amenable number.

78444029 is a deficient number, since it is larger than the sum of its proper divisors (1913311).

78444029 is a wasteful number, since it uses less digits than its factorization.

78444029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913310.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 78444029 is about 8856.8633838397. The cubic root of 78444029 is about 428.0750970943.

The spelling of 78444029 in words is "seventy-eight million, four hundred forty-four thousand, twenty-nine".