55631785 has 16 divisors (see below), whose sum is σ = 74380032. Its totient is φ = 39596800.

The previous prime is 55631759. The next prime is 55631789. The reversal of 55631785 is 58713655.

It is not a de Polignac number, because 55631785 - 2¹¹ = 55629737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55631789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8176 + ... + 13345.

It is an arithmetic number, because the mean of its divisors is an integer number (4648752).

Almost surely, 2^55631785 is an apocalyptic number.

55631785 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55631785 is a deficient number, since it is larger than the sum of its proper divisors (18748247).

55631785 is a wasteful number, since it uses less digits than its factorization.

55631785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21584.

The product of its digits is 126000, while the sum is 40.

The square root of 55631785 is about 7458.6717986516. The cubic root of 55631785 is about 381.7458562845.

The spelling of 55631785 in words is "fifty-five million, six hundred thirty-one thousand, seven hundred eighty-five".