55385787 has 8 divisors (see below), whose sum is σ = 75419136. Its totient is φ = 36138152.

The previous prime is 55385783. The next prime is 55385831. The reversal of 55385787 is 78758355.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 55385787 - 2² = 55385783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55385783) 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, 196263 + ... + 196544.

It is an arithmetic number, because the mean of its divisors is an integer number (9427392).

Almost surely, 2^55385787 is an apocalyptic number.

55385787 is a deficient number, since it is larger than the sum of its proper divisors (20033349).

55385787 is a wasteful number, since it uses less digits than its factorization.

55385787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392857.

The product of its digits is 1176000, while the sum is 48.

The square root of 55385787 is about 7442.1627904797. The cubic root of 55385787 is about 381.1823446373.

It can be divided in two parts, 5538 and 5787, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 55385787 in words is "fifty-five million, three hundred eighty-five thousand, seven hundred eighty-seven".