78006451 has 2 divisors, whose sum is σ = 78006452. Its totient is φ = 78006450.

The previous prime is 78006431. The next prime is 78006469. The reversal of 78006451 is 15460087.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78006451 is a prime.

It is not a weakly prime, because it can be changed into another prime (78006431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39003225 + 39003226.

It is an arithmetic number, because the mean of its divisors is an integer number (39003226).

Almost surely, 2^78006451 is an apocalyptic number.

78006451 is a deficient number, since it is larger than the sum of its proper divisors (1).

78006451 is an equidigital number, since it uses as much as digits as its factorization.

78006451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 78006451 is about 8832.1260747342. The cubic root of 78006451 is about 427.2776468712.

The spelling of 78006451 in words is "seventy-eight million, six thousand, four hundred fifty-one".