55649745 has 12 divisors (see below), whose sum is σ = 96459636. Its totient is φ = 29679840.

The previous prime is 55649723. The next prime is 55649747. The reversal of 55649745 is 54794655.

55649745 is a `hidden beast` number, since 556 + 4 + 97 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 35856144 + 19793601 = 5988^2 + 4449^2 .

It is not a de Polignac number, because 55649745 - 2¹⁰ = 55648721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1236661 = 55649745 / (5 + 5 + 6 + 4 + 9 + 7 + 4 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55649745.

It is not an unprimeable number, because it can be changed into a prime (55649747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 618286 + ... + 618375.

It is an arithmetic number, because the mean of its divisors is an integer number (8038303).

Almost surely, 2^55649745 is an apocalyptic number.

It is an amenable number.

55649745 is a deficient number, since it is larger than the sum of its proper divisors (40809891).

55649745 is a wasteful number, since it uses less digits than its factorization.

55649745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236672 (or 1236669 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 55649745 is about 7459.8756692052. The cubic root of 55649745 is about 381.7869324301.

The spelling of 55649745 in words is "fifty-five million, six hundred forty-nine thousand, seven hundred forty-five".