55487745 has 24 divisors (see below), whose sum is σ = 101837736. Its totient is φ = 27852288.

The previous prime is 55487743. The next prime is 55487791. The reversal of 55487745 is 54778455.

It can be written as a sum of positive squares in 4 ways, for example, as 20061441 + 35426304 = 4479^2 + 5952^2 .

It is not a de Polignac number, because 55487745 - 2¹ = 55487743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 55487745.

It is not an unprimeable number, because it can be changed into a prime (55487743) 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, 35502 + ... + 37031.

It is an arithmetic number, because the mean of its divisors is an integer number (4243239).

Almost surely, 2^55487745 is an apocalyptic number.

It is an amenable number.

55487745 is a deficient number, since it is larger than the sum of its proper divisors (46349991).

55487745 is a wasteful number, since it uses less digits than its factorization.

55487745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72561 (or 72558 counting only the distinct ones).

The product of its digits is 784000, while the sum is 45.

The square root of 55487745 is about 7449.0096657207. The cubic root of 55487745 is about 381.4161035596.

The spelling of 55487745 in words is "fifty-five million, four hundred eighty-seven thousand, seven hundred forty-five".