78748751 has 2 divisors, whose sum is σ = 78748752. Its totient is φ = 78748750.

The previous prime is 78748729. The next prime is 78748799. The reversal of 78748751 is 15784787.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78748751 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78748696 and 78748705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78748151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39374375 + 39374376.

It is an arithmetic number, because the mean of its divisors is an integer number (39374376).

Almost surely, 2^78748751 is an apocalyptic number.

78748751 is a deficient number, since it is larger than the sum of its proper divisors (1).

78748751 is an equidigital number, since it uses as much as digits as its factorization.

78748751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 439040, while the sum is 47.

The square root of 78748751 is about 8874.0493011928. The cubic root of 78748751 is about 428.6286780294.

The spelling of 78748751 in words is "seventy-eight million, seven hundred forty-eight thousand, seven hundred fifty-one".