78725701 has 2 divisors, whose sum is σ = 78725702. Its totient is φ = 78725700.

The previous prime is 78725671. The next prime is 78725741. The reversal of 78725701 is 10752787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51696100 + 27029601 = 7190^2 + 5199^2 .

It is an emirp because it is prime and its reverse (10752787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78725701 - 2¹¹ = 78723653 is a prime.

It is a super-3 number, since 3×78725701³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78725741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39362850 + 39362851.

It is an arithmetic number, because the mean of its divisors is an integer number (39362851).

Almost surely, 2^78725701 is an apocalyptic number.

It is an amenable number.

78725701 is a deficient number, since it is larger than the sum of its proper divisors (1).

78725701 is an equidigital number, since it uses as much as digits as its factorization.

78725701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 78725701 is about 8872.7504754726. The cubic root of 78725701 is about 428.5868536406.

The spelling of 78725701 in words is "seventy-eight million, seven hundred twenty-five thousand, seven hundred one".