78749651 has 2 divisors, whose sum is σ = 78749652. Its totient is φ = 78749650.

The previous prime is 78749647. The next prime is 78749659. The reversal of 78749651 is 15694787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78749651 - 2² = 78749647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78749596 and 78749605.

It is not a weakly prime, because it can be changed into another prime (78749659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39374825 + 39374826.

It is an arithmetic number, because the mean of its divisors is an integer number (39374826).

Almost surely, 2^78749651 is an apocalyptic number.

78749651 is a deficient number, since it is larger than the sum of its proper divisors (1).

78749651 is an equidigital number, since it uses as much as digits as its factorization.

78749651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 78749651 is about 8874.1000107053. The cubic root of 78749651 is about 428.6303109202.

The spelling of 78749651 in words is "seventy-eight million, seven hundred forty-nine thousand, six hundred fifty-one".