55028730 has 32 divisors (see below), whose sum is σ = 132485184. Its totient is φ = 14628096.

The previous prime is 55028713. The next prime is 55028749. The reversal of 55028730 is 3782055.

It is a happy number.

It is a super-2 number, since 2×55028730² = 6056322250825800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7389 + ... + 12831.

It is an arithmetic number, because the mean of its divisors is an integer number (4140162).

Almost surely, 2^55028730 is an apocalyptic number.

55028730 is an abundant number, since it is smaller than the sum of its proper divisors (77456454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55028730 is a wasteful number, since it uses less digits than its factorization.

55028730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5790.

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

The square root of 55028730 is about 7418.1352104151. The cubic root of 55028730 is about 380.3614520188.

The spelling of 55028730 in words is "fifty-five million, twenty-eight thousand, seven hundred thirty".