55477785 has 32 divisors (see below), whose sum is σ = 97822080. Its totient is φ = 26624000.

The previous prime is 55477733. The next prime is 55477787. The reversal of 55477785 is 58777455.

It is a happy number.

It is not a de Polignac number, because 55477785 - 2⁸ = 55477529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55477787) 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, 15001 + ... + 18329.

It is an arithmetic number, because the mean of its divisors is an integer number (3056940).

Almost surely, 2^55477785 is an apocalyptic number.

55477785 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55477785 is a deficient number, since it is larger than the sum of its proper divisors (42344295).

55477785 is a wasteful number, since it uses less digits than its factorization.

55477785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449.

The product of its digits is 1372000, while the sum is 48.

The square root of 55477785 is about 7448.3410904711. The cubic root of 55477785 is about 381.3932809122.

The spelling of 55477785 in words is "fifty-five million, four hundred seventy-seven thousand, seven hundred eighty-five".