78873629 has 2 divisors, whose sum is σ = 78873630. Its totient is φ = 78873628.

The previous prime is 78873611. The next prime is 78873631. The reversal of 78873629 is 92637887.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58171129 + 20702500 = 7627^2 + 4550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78873629 is a prime.

Together with 78873631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78873689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39436814 + 39436815.

It is an arithmetic number, because the mean of its divisors is an integer number (39436815).

Almost surely, 2^78873629 is an apocalyptic number.

It is an amenable number.

78873629 is a deficient number, since it is larger than the sum of its proper divisors (1).

78873629 is an equidigital number, since it uses as much as digits as its factorization.

78873629 is an evil number, because the sum of its binary digits is even.

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

The square root of 78873629 is about 8881.0826479658. The cubic root of 78873629 is about 428.8551282807.

The spelling of 78873629 in words is "seventy-eight million, eight hundred seventy-three thousand, six hundred twenty-nine".