55387649 has 4 divisors (see below), whose sum is σ = 58645764. Its totient is φ = 52129536.

The previous prime is 55387639. The next prime is 55387681. The reversal of 55387649 is 94678355.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23668225 + 31719424 = 4865^2 + 5632^2 .

It is a cyclic number.

It is not a de Polignac number, because 55387649 - 2⁸ = 55387393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55387639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1629032 + ... + 1629065.

It is an arithmetic number, because the mean of its divisors is an integer number (14661441).

Almost surely, 2^55387649 is an apocalyptic number.

It is an amenable number.

55387649 is a deficient number, since it is larger than the sum of its proper divisors (3258115).

55387649 is a wasteful number, since it uses less digits than its factorization.

55387649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258114.

The product of its digits is 907200, while the sum is 47.

The square root of 55387649 is about 7442.2878874712. The cubic root of 55387649 is about 381.1866162119.

The spelling of 55387649 in words is "fifty-five million, three hundred eighty-seven thousand, six hundred forty-nine".