78429749 has 4 divisors (see below), whose sum is σ = 78471360. Its totient is φ = 78388140.

The previous prime is 78429733. The next prime is 78429763. The reversal of 78429749 is 94792487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94792487 = 163 ⋅581549.

It is a cyclic number.

It is not a de Polignac number, because 78429749 - 2⁴ = 78429733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78429697 and 78429706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78429779) 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, 17837 + ... + 21794.

It is an arithmetic number, because the mean of its divisors is an integer number (19617840).

Almost surely, 2^78429749 is an apocalyptic number.

It is an amenable number.

78429749 is a deficient number, since it is larger than the sum of its proper divisors (41611).

78429749 is a wasteful number, since it uses less digits than its factorization.

78429749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41610.

The product of its digits is 1016064, while the sum is 50.

The square root of 78429749 is about 8856.0571926789. The cubic root of 78429749 is about 428.0491198320.

The spelling of 78429749 in words is "seventy-eight million, four hundred twenty-nine thousand, seven hundred forty-nine".