78478477 has 32 divisors (see below), whose sum is σ = 104509440. Its totient is φ = 57050880.

The previous prime is 78478471. The next prime is 78478489. The reversal of 78478477 is 77487487.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78478477 - 2⁷ = 78478349 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 218424 + ... + 218782.

It is an arithmetic number, because the mean of its divisors is an integer number (3265920).

Almost surely, 2^78478477 is an apocalyptic number.

78478477 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

78478477 is a deficient number, since it is larger than the sum of its proper divisors (26030963).

78478477 is a wasteful number, since it uses less digits than its factorization.

78478477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561.

The product of its digits is 2458624, while the sum is 52.

The square root of 78478477 is about 8858.8078769098. The cubic root of 78478477 is about 428.1377497189.

Multiplying 78478477 by its sum of digits (52), we get a palindrome (4080880804).

The spelling of 78478477 in words is "seventy-eight million, four hundred seventy-eight thousand, four hundred seventy-seven".