84478477 has 2 divisors, whose sum is σ = 84478478. Its totient is φ = 84478476.

The previous prime is 84478469. The next prime is 84478487. The reversal of 84478477 is 77487448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75151561 + 9326916 = 8669^2 + 3054^2 .

It is a cyclic number.

It is not a de Polignac number, because 84478477 - 2³ = 84478469 is a prime.

It is a super-2 number, since 2×84478477² = 14273226152479058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84478477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84478417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42239238 + 42239239.

It is an arithmetic number, because the mean of its divisors is an integer number (42239239).

Almost surely, 2^84478477 is an apocalyptic number.

It is an amenable number.

84478477 is a deficient number, since it is larger than the sum of its proper divisors (1).

84478477 is an equidigital number, since it uses as much as digits as its factorization.

84478477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1404928, while the sum is 49.

The square root of 84478477 is about 9191.2173840031. The cubic root of 84478477 is about 438.7818873857.

The spelling of 84478477 in words is "eighty-four million, four hundred seventy-eight thousand, four hundred seventy-seven".