78378467 has 4 divisors (see below), whose sum is σ = 79857360. Its totient is φ = 76899576.

The previous prime is 78378413. The next prime is 78378481. The reversal of 78378467 is 76487387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76487387 = 6271 ⋅12197.

It is a cyclic number.

It is not a de Polignac number, because 78378467 - 2¹⁰ = 78377443 is a prime.

It is a super-2 number, since 2×78378467² = 12286368178540178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78378767) 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, 739367 + ... + 739472.

It is an arithmetic number, because the mean of its divisors is an integer number (19964340).

Almost surely, 2^78378467 is an apocalyptic number.

78378467 is a deficient number, since it is larger than the sum of its proper divisors (1478893).

78378467 is a wasteful number, since it uses less digits than its factorization.

78378467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478892.

The product of its digits is 1580544, while the sum is 50.

The square root of 78378467 is about 8853.1614127384. The cubic root of 78378467 is about 427.9558048959.

The spelling of 78378467 in words is "seventy-eight million, three hundred seventy-eight thousand, four hundred sixty-seven".