55728001 has 4 divisors (see below), whose sum is σ = 63689152. Its totient is φ = 47766852.

The previous prime is 55727999. The next prime is 55728017. The reversal of 55728001 is 10082755.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10082755 = 5 ⋅2016551.

It is not a de Polignac number, because 55728001 - 2¹ = 55727999 is a prime.

It is a super-2 number, since 2×55728001² = 6211220190912002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55728901) 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, 3980565 + ... + 3980578.

It is an arithmetic number, because the mean of its divisors is an integer number (15922288).

Almost surely, 2^55728001 is an apocalyptic number.

It is an amenable number.

55728001 is a deficient number, since it is larger than the sum of its proper divisors (7961151).

55728001 is an equidigital number, since it uses as much as digits as its factorization.

55728001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7961150.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 55728001 is about 7465.1189541761. The cubic root of 55728001 is about 381.9658079097.

The spelling of 55728001 in words is "fifty-five million, seven hundred twenty-eight thousand, one".