78214399 has 4 divisors (see below), whose sum is σ = 82815264. Its totient is φ = 73613536.

The previous prime is 78214391. The next prime is 78214427. The reversal of 78214399 is 99341287.

78214399 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78214399 - 2³ = 78214391 is a prime.

It is a super-2 number, since 2×78214399² = 12234984421862402, 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 (78214391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2300407 + ... + 2300440.

It is an arithmetic number, because the mean of its divisors is an integer number (20703816).

Almost surely, 2^78214399 is an apocalyptic number.

78214399 is a deficient number, since it is larger than the sum of its proper divisors (4600865).

78214399 is a wasteful number, since it uses less digits than its factorization.

78214399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600864.

The product of its digits is 108864, while the sum is 43.

The square root of 78214399 is about 8843.8904900502. The cubic root of 78214399 is about 427.6569859935.

The spelling of 78214399 in words is "seventy-eight million, two hundred fourteen thousand, three hundred ninety-nine".