78226651 has 2 divisors, whose sum is σ = 78226652. Its totient is φ = 78226650.

The previous prime is 78226649. The next prime is 78226661. The reversal of 78226651 is 15662287.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78226651 - 2¹ = 78226649 is a prime.

It is a super-2 number, since 2×78226651² = 12238817853351602, which contains 22 as substring.

Together with 78226649, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78226651.

It is not a weakly prime, because it can be changed into another prime (78226661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39113325 + 39113326.

It is an arithmetic number, because the mean of its divisors is an integer number (39113326).

Almost surely, 2^78226651 is an apocalyptic number.

78226651 is a deficient number, since it is larger than the sum of its proper divisors (1).

78226651 is an equidigital number, since it uses as much as digits as its factorization.

78226651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 78226651 is about 8844.5831445015. The cubic root of 78226651 is about 427.6793151294.

The spelling of 78226651 in words is "seventy-eight million, two hundred twenty-six thousand, six hundred fifty-one".