55262721 has 8 divisors (see below), whose sum is σ = 76887360. Its totient is φ = 35239952.

The previous prime is 55262689. The next prime is 55262723. The reversal of 55262721 is 12726255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55262721 - 2⁵ = 55262689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55262723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400386 + ... + 400523.

It is an arithmetic number, because the mean of its divisors is an integer number (9610920).

Almost surely, 2^55262721 is an apocalyptic number.

It is an amenable number.

55262721 is a deficient number, since it is larger than the sum of its proper divisors (21624639).

55262721 is a wasteful number, since it uses less digits than its factorization.

55262721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800935.

The product of its digits is 8400, while the sum is 30.

The square root of 55262721 is about 7433.8900314707. The cubic root of 55262721 is about 380.8998090105.

Adding to 55262721 its reverse (12726255), we get a palindrome (67988976).

The spelling of 55262721 in words is "fifty-five million, two hundred sixty-two thousand, seven hundred twenty-one".