78374399 has 8 divisors (see below), whose sum is σ = 81514560. Its totient is φ = 75288096.

The previous prime is 78374393. The next prime is 78374419. The reversal of 78374399 is 99347387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78374399 - 2⁸ = 78374143 is a prime.

It is a super-2 number, since 2×78374399² = 12285092837222402, 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 (78374393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10484 + ... + 16329.

It is an arithmetic number, because the mean of its divisors is an integer number (10189320).

Almost surely, 2^78374399 is an apocalyptic number.

78374399 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

78374399 is a deficient number, since it is larger than the sum of its proper divisors (3140161).

78374399 is a wasteful number, since it uses less digits than its factorization.

78374399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26929.

The product of its digits is 1143072, while the sum is 50.

The square root of 78374399 is about 8852.9316613199. The cubic root of 78374399 is about 427.9484008456.

The spelling of 78374399 in words is "seventy-eight million, three hundred seventy-four thousand, three hundred ninety-nine".