78785801 has 2 divisors, whose sum is σ = 78785802. Its totient is φ = 78785800.

The previous prime is 78785797. The next prime is 78785807. The reversal of 78785801 is 10858787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71842576 + 6943225 = 8476^2 + 2635^2 .

It is a cyclic number.

It is not a de Polignac number, because 78785801 - 2² = 78785797 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78785807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39392900 + 39392901.

It is an arithmetic number, because the mean of its divisors is an integer number (39392901).

Almost surely, 2^78785801 is an apocalyptic number.

It is an amenable number.

78785801 is a deficient number, since it is larger than the sum of its proper divisors (1).

78785801 is an equidigital number, since it uses as much as digits as its factorization.

78785801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 44.

The square root of 78785801 is about 8876.1366032751. The cubic root of 78785801 is about 428.6958884187.

The spelling of 78785801 in words is "seventy-eight million, seven hundred eighty-five thousand, eight hundred one".