78485801 has 2 divisors, whose sum is σ = 78485802. Its totient is φ = 78485800.

The previous prime is 78485791. The next prime is 78485839. The reversal of 78485801 is 10858487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50395801 + 28090000 = 7099^2 + 5300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78485801 is a prime.

It is a super-2 number, since 2×78485801² = 12320041917223202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78482801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39242900 + 39242901.

It is an arithmetic number, because the mean of its divisors is an integer number (39242901).

Almost surely, 2^78485801 is an apocalyptic number.

It is an amenable number.

78485801 is a deficient number, since it is larger than the sum of its proper divisors (1).

78485801 is an equidigital number, since it uses as much as digits as its factorization.

78485801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 78485801 is about 8859.2212411701. The cubic root of 78485801 is about 428.1510679494.

The spelling of 78485801 in words is "seventy-eight million, four hundred eighty-five thousand, eight hundred one".