78440701 has 2 divisors, whose sum is σ = 78440702. Its totient is φ = 78440700.

The previous prime is 78440671. The next prime is 78440753. The reversal of 78440701 is 10704487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61622500 + 16818201 = 7850^2 + 4101^2 .

It is an emirp because it is prime and its reverse (10704487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78440701 - 2¹¹ = 78438653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78440101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39220350 + 39220351.

It is an arithmetic number, because the mean of its divisors is an integer number (39220351).

Almost surely, 2^78440701 is an apocalyptic number.

It is an amenable number.

78440701 is a deficient number, since it is larger than the sum of its proper divisors (1).

78440701 is an equidigital number, since it uses as much as digits as its factorization.

78440701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 78440701 is about 8856.6755049511. The cubic root of 78440701 is about 428.0690432914.

The spelling of 78440701 in words is "seventy-eight million, four hundred forty thousand, seven hundred one".