78478478477 has 16 divisors (see below), whose sum is σ = 92930820480. Its totient is φ = 64879444032.

The previous prime is 78478478459. The next prime is 78478478489. The reversal of 78478478477 is 77487487487.

It is a cyclic number.

It is not a de Polignac number, because 78478478477 - 2¹⁴ = 78478462093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78478478477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78478478677) 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 15 ways as a sum of consecutive naturals, for example, 1770758 + ... + 1814535.

It is an arithmetic number, because the mean of its divisors is an integer number (5808176280).

Almost surely, 2^78478478477 is an apocalyptic number.

It is an amenable number.

78478478477 is a deficient number, since it is larger than the sum of its proper divisors (14452342003).

78478478477 is a wasteful number, since it uses less digits than its factorization.

78478478477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3585412.

The product of its digits is 550731776, while the sum is 71.

The spelling of 78478478477 in words is "seventy-eight billion, four hundred seventy-eight million, four hundred seventy-eight thousand, four hundred seventy-seven".