55511787 has 8 divisors (see below), whose sum is σ = 77911360. Its totient is φ = 35060040.

The previous prime is 55511773. The next prime is 55511791. The reversal of 55511787 is 78711555.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55511787 - 2¹⁵ = 55479019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55511717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486889 + ... + 487002.

It is an arithmetic number, because the mean of its divisors is an integer number (9738920).

Almost surely, 2^55511787 is an apocalyptic number.

55511787 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

55511787 is a deficient number, since it is larger than the sum of its proper divisors (22399573).

55511787 is a wasteful number, since it uses less digits than its factorization.

55511787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973913.

The product of its digits is 49000, while the sum is 39.

The square root of 55511787 is about 7450.6232625197. The cubic root of 55511787 is about 381.4711828801.

The spelling of 55511787 in words is "fifty-five million, five hundred eleven thousand, seven hundred eighty-seven".