55505775 has 24 divisors (see below), whose sum is σ = 98830480. Its totient is φ = 27325440.

The previous prime is 55505771. The next prime is 55505789. The reversal of 55505775 is 57750555.

It is not a de Polignac number, because 55505775 - 2² = 55505771 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55505771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27490 + ... + 29439.

Almost surely, 2^55505775 is an apocalyptic number.

55505775 is a deficient number, since it is larger than the sum of its proper divisors (43324705).

55505775 is a wasteful number, since it uses less digits than its factorization.

55505775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56955 (or 56950 counting only the distinct ones).

The product of its (nonzero) digits is 153125, while the sum is 39.

The square root of 55505775 is about 7450.2197954154. The cubic root of 55505775 is about 381.4574111049.

It can be divided in two parts, 55505 and 775, that added together give a triangular number (56280 = T₃₃₅).

The spelling of 55505775 in words is "fifty-five million, five hundred five thousand, seven hundred seventy-five".