78736451 has 2 divisors, whose sum is σ = 78736452. Its totient is φ = 78736450.

The previous prime is 78736433. The next prime is 78736487. The reversal of 78736451 is 15463787.

It is a weak prime.

It is an emirp because it is prime and its reverse (15463787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78736451 - 2¹⁰ = 78735427 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78736399 and 78736408.

It is not a weakly prime, because it can be changed into another prime (78736051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39368225 + 39368226.

It is an arithmetic number, because the mean of its divisors is an integer number (39368226).

Almost surely, 2^78736451 is an apocalyptic number.

78736451 is a deficient number, since it is larger than the sum of its proper divisors (1).

78736451 is an equidigital number, since it uses as much as digits as its factorization.

78736451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 78736451 is about 8873.3562421442. The cubic root of 78736451 is about 428.6063606077.

The spelling of 78736451 in words is "seventy-eight million, seven hundred thirty-six thousand, four hundred fifty-one".