78803321 has 2 divisors, whose sum is σ = 78803322. Its totient is φ = 78803320.

The previous prime is 78803311. The next prime is 78803339. The reversal of 78803321 is 12330887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78145600 + 657721 = 8840^2 + 811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78803321 is a prime.

It is not a weakly prime, because it can be changed into another prime (78803311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39401660 + 39401661.

It is an arithmetic number, because the mean of its divisors is an integer number (39401661).

Almost surely, 2^78803321 is an apocalyptic number.

It is an amenable number.

78803321 is a deficient number, since it is larger than the sum of its proper divisors (1).

78803321 is an equidigital number, since it uses as much as digits as its factorization.

78803321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 78803321 is about 8877.1234642760. The cubic root of 78803321 is about 428.7276631599.

The spelling of 78803321 in words is "seventy-eight million, eight hundred three thousand, three hundred twenty-one".