78743251 has 4 divisors (see below), whose sum is σ = 78863400. Its totient is φ = 78623104.

The previous prime is 78743227. The next prime is 78743257. The reversal of 78743251 is 15234787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15234787 = 37 ⋅411751.

It is a cyclic number.

It is not a de Polignac number, because 78743251 - 2⁵ = 78743219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78743251.

It is not an unprimeable number, because it can be changed into a prime (78743257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59086 + ... + 60403.

It is an arithmetic number, because the mean of its divisors is an integer number (19715850).

Almost surely, 2^78743251 is an apocalyptic number.

78743251 is a deficient number, since it is larger than the sum of its proper divisors (120149).

78743251 is a wasteful number, since it uses less digits than its factorization.

78743251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120148.

The product of its digits is 47040, while the sum is 37.

The square root of 78743251 is about 8873.7394034308. The cubic root of 78743251 is about 428.6186989818.

The spelling of 78743251 in words is "seventy-eight million, seven hundred forty-three thousand, two hundred fifty-one".