54781787 has 4 divisors (see below), whose sum is σ = 55149600. Its totient is φ = 54413976.

The previous prime is 54781777. The next prime is 54781829. The reversal of 54781787 is 78718745.

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

It is a cyclic number.

It is not a de Polignac number, because 54781787 - 2¹⁰ = 54780763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54781747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183683 + ... + 183980.

It is an arithmetic number, because the mean of its divisors is an integer number (13787400).

Almost surely, 2^54781787 is an apocalyptic number.

54781787 is a deficient number, since it is larger than the sum of its proper divisors (367813).

54781787 is a wasteful number, since it uses less digits than its factorization.

54781787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367812.

The product of its digits is 439040, while the sum is 47.

The square root of 54781787 is about 7401.4719482006. The cubic root of 54781787 is about 379.7916378490.

The spelling of 54781787 in words is "fifty-four million, seven hundred eighty-one thousand, seven hundred eighty-seven".