78320241 has 12 divisors (see below), whose sum is σ = 119784132. Its totient is φ = 49142016.

The previous prime is 78320233. The next prime is 78320251. The reversal of 78320241 is 14202387.

It can be written as a sum of positive squares in 2 ways, for example, as 67568400 + 10751841 = 8220^2 + 3279^2 .

It is not a de Polignac number, because 78320241 - 2³ = 78320233 is a prime.

It is a super-2 number, since 2×78320241² = 12268120300596162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78320201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255796 + ... + 256101.

It is an arithmetic number, because the mean of its divisors is an integer number (9982011).

Almost surely, 2^78320241 is an apocalyptic number.

It is an amenable number.

78320241 is a deficient number, since it is larger than the sum of its proper divisors (41463891).

78320241 is a wasteful number, since it uses less digits than its factorization.

78320241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511920 (or 511917 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 78320241 is about 8849.8723719611. The cubic root of 78320241 is about 427.8498050016.

The spelling of 78320241 in words is "seventy-eight million, three hundred twenty thousand, two hundred forty-one".