78406751 has 2 divisors, whose sum is σ = 78406752. Its totient is φ = 78406750.

The previous prime is 78406739. The next prime is 78406753. The reversal of 78406751 is 15760487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78406751 - 2⁶ = 78406687 is a prime.

It is a super-2 number, since 2×78406751² = 12295237204752002, which contains 22 as substring.

Together with 78406753, 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 (78406753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39203375 + 39203376.

It is an arithmetic number, because the mean of its divisors is an integer number (39203376).

Almost surely, 2^78406751 is an apocalyptic number.

78406751 is a deficient number, since it is larger than the sum of its proper divisors (1).

78406751 is an equidigital number, since it uses as much as digits as its factorization.

78406751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 78406751 is about 8854.7586641308. The cubic root of 78406751 is about 428.0072767127.

The spelling of 78406751 in words is "seventy-eight million, four hundred six thousand, seven hundred fifty-one".