55307657 has 4 divisors (see below), whose sum is σ = 55325076. Its totient is φ = 55290240.

The previous prime is 55307653. The next prime is 55307671. The reversal of 55307657 is 75670355.

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 53640976 + 1666681 = 7324^2 + 1291^2 .

It is a cyclic number.

It is not a de Polignac number, because 55307657 - 2² = 55307653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55307657.

It is not an unprimeable number, because it can be changed into a prime (55307653) 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, 2444 + ... + 10797.

It is an arithmetic number, because the mean of its divisors is an integer number (13831269).

Almost surely, 2^55307657 is an apocalyptic number.

It is an amenable number.

55307657 is a deficient number, since it is larger than the sum of its proper divisors (17419).

55307657 is a wasteful number, since it uses less digits than its factorization.

55307657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17418.

The product of its (nonzero) digits is 110250, while the sum is 38.

The square root of 55307657 is about 7436.9117918663. The cubic root of 55307657 is about 381.0030219080.

The spelling of 55307657 in words is "fifty-five million, three hundred seven thousand, six hundred fifty-seven".