78408311 has 4 divisors (see below), whose sum is σ = 81817392. Its totient is φ = 74999232.

The previous prime is 78408299. The next prime is 78408313. The reversal of 78408311 is 11380487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11380487 = 19 ⋅598973.

It is a cyclic number.

It is not a de Polignac number, because 78408311 - 2⁶ = 78408247 is a prime.

It is a super-2 number, since 2×78408311² = 12295726467745442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78408313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1704506 + ... + 1704551.

It is an arithmetic number, because the mean of its divisors is an integer number (20454348).

Almost surely, 2^78408311 is an apocalyptic number.

78408311 is a deficient number, since it is larger than the sum of its proper divisors (3409081).

78408311 is a wasteful number, since it uses less digits than its factorization.

78408311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3409080.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 78408311 is about 8854.8467519207. The cubic root of 78408311 is about 428.0101152732.

Adding to 78408311 its reverse (11380487), we get a palindrome (89788798).

The spelling of 78408311 in words is "seventy-eight million, four hundred eight thousand, three hundred eleven".