78454406 has 4 divisors (see below), whose sum is σ = 117681612. Its totient is φ = 39227202.

The previous prime is 78454399. The next prime is 78454423. The reversal of 78454406 is 60445487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60445487 = 43 ⋅1405709.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78454406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19613600 + ... + 19613603.

It is an arithmetic number, because the mean of its divisors is an integer number (29420403).

Almost surely, 2^78454406 is an apocalyptic number.

78454406 is a deficient number, since it is larger than the sum of its proper divisors (39227206).

78454406 is a wasteful number, since it uses less digits than its factorization.

78454406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39227205.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 78454406 is about 8857.4491813388. The cubic root of 78454406 is about 428.0939722909.

The spelling of 78454406 in words is "seventy-eight million, four hundred fifty-four thousand, four hundred six".