53778487 has 4 divisors (see below), whose sum is σ = 61461136. Its totient is φ = 46095840.

The previous prime is 53778469. The next prime is 53778523. The reversal of 53778487 is 78487735.

53778487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 53778487 - 2¹¹ = 53776439 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 53778487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53778437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3841314 + ... + 3841327.

It is an arithmetic number, because the mean of its divisors is an integer number (15365284).

Almost surely, 2^53778487 is an apocalyptic number.

53778487 is a deficient number, since it is larger than the sum of its proper divisors (7682649).

53778487 is an equidigital number, since it uses as much as digits as its factorization.

53778487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7682648.

The product of its digits is 1317120, while the sum is 49.

The square root of 53778487 is about 7333.3816892345. The cubic root of 53778487 is about 377.4587753763.

The spelling of 53778487 in words is "fifty-three million, seven hundred seventy-eight thousand, four hundred eighty-seven".