78454407 has 4 divisors (see below), whose sum is σ = 104605880. Its totient is φ = 52302936.

The previous prime is 78454399. The next prime is 78454423. The reversal of 78454407 is 70445487.

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

It is not a de Polignac number, because 78454407 - 2³ = 78454399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78454427) 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, 13075732 + ... + 13075737.

It is an arithmetic number, because the mean of its divisors is an integer number (26151470).

Almost surely, 2^78454407 is an apocalyptic number.

78454407 is a deficient number, since it is larger than the sum of its proper divisors (26151473).

78454407 is a wasteful number, since it uses less digits than its factorization.

78454407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26151472.

The product of its (nonzero) digits is 125440, while the sum is 39.

The square root of 78454407 is about 8857.4492377885. The cubic root of 78454407 is about 428.0939741098.

The spelling of 78454407 in words is "seventy-eight million, four hundred fifty-four thousand, four hundred seven".