55115775 has 96 divisors (see below), whose sum is σ = 119159040. Its totient is φ = 24624000.

The previous prime is 55115773. The next prime is 55115783. The reversal of 55115775 is 57751155.

It is a Cunningham number, because it is equal to 7424²-1.

It is not a de Polignac number, because 55115775 - 2¹ = 55115773 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55115773) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 96240 + ... + 96810.

It is an arithmetic number, because the mean of its divisors is an integer number (1241240).

Almost surely, 2^55115775 is an apocalyptic number.

55115775 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55115775 is an abundant number, since it is smaller than the sum of its proper divisors (64043265).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55115775 is a wasteful number, since it uses less digits than its factorization.

55115775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 603 counting only the distinct ones).

The product of its digits is 30625, while the sum is 36.

The square root of 55115775 is about 7423.9999326509. Note that the first 4 decimals coincide. The cubic root of 55115775 is about 380.5618995594.

The spelling of 55115775 in words is "fifty-five million, one hundred fifteen thousand, seven hundred seventy-five".