55072723 has 4 divisors (see below), whose sum is σ = 56353528. Its totient is φ = 53791920.

The previous prime is 55072681. The next prime is 55072747. The reversal of 55072723 is 32727055.

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

It is a cyclic number.

It is not a de Polignac number, because 55072723 - 2¹⁷ = 54941651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55072753) 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, 640338 + ... + 640423.

It is an arithmetic number, because the mean of its divisors is an integer number (14088382).

Almost surely, 2^55072723 is an apocalyptic number.

55072723 is a deficient number, since it is larger than the sum of its proper divisors (1280805).

55072723 is a wasteful number, since it uses less digits than its factorization.

55072723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280804.

The product of its (nonzero) digits is 14700, while the sum is 31.

The square root of 55072723 is about 7421.0998511002. The cubic root of 55072723 is about 380.4627856566.

Adding to 55072723 its reverse (32727055), we get a palindrome (87799778).

The spelling of 55072723 in words is "fifty-five million, seventy-two thousand, seven hundred twenty-three".