30028155 has 32 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 15586560.

The previous prime is 30028153. The next prime is 30028177. The reversal of 30028155 is 55182003.

It is not a de Polignac number, because 30028155 - 2¹ = 30028153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30028153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110670 + ... + 110940.

It is an arithmetic number, because the mean of its divisors is an integer number (1542240).

Almost surely, 2^30028155 is an apocalyptic number.

30028155 is a deficient number, since it is larger than the sum of its proper divisors (19323525).

30028155 is a wasteful number, since it uses less digits than its factorization.

30028155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 30028155 is about 5479.7951604052. The cubic root of 30028155 is about 310.8204247926.

The spelling of 30028155 in words is "thirty million, twenty-eight thousand, one hundred fifty-five".