78478478 has 16 divisors (see below), whose sum is σ = 129167136. Its totient is φ = 35536800.

The previous prime is 78478471. The next prime is 78478489. The reversal of 78478478 is 87487487.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78478471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27098 + ... + 29853.

It is an arithmetic number, because the mean of its divisors is an integer number (8072946).

Almost surely, 2^78478478 is an apocalyptic number.

78478478 is a deficient number, since it is larger than the sum of its proper divisors (50688658).

78478478 is a wasteful number, since it uses less digits than its factorization.

78478478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57019.

The product of its digits is 2809856, while the sum is 53.

The square root of 78478478 is about 8858.8079333509. The cubic root of 78478478 is about 428.1377515374.

Subtracting 78478478 from its reverse (87487487), we obtain a palindrome (9009009).

The spelling of 78478478 in words is "seventy-eight million, four hundred seventy-eight thousand, four hundred seventy-eight".