78235321 has 2 divisors, whose sum is σ = 78235322. Its totient is φ = 78235320.

The previous prime is 78235303. The next prime is 78235327. The reversal of 78235321 is 12353287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78234025 + 1296 = 8845^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 78235321 - 2¹⁷ = 78104249 is a prime.

It is a super-2 number, since 2×78235321² = 12241530903946082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78235327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39117660 + 39117661.

It is an arithmetic number, because the mean of its divisors is an integer number (39117661).

Almost surely, 2^78235321 is an apocalyptic number.

It is an amenable number.

78235321 is a deficient number, since it is larger than the sum of its proper divisors (1).

78235321 is an equidigital number, since it uses as much as digits as its factorization.

78235321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 78235321 is about 8845.0732614264. The cubic root of 78235321 is about 427.6951147008.

It can be divided in two parts, 7 and 8235321, that added together give a palindrome (8235328).

The spelling of 78235321 in words is "seventy-eight million, two hundred thirty-five thousand, three hundred twenty-one".