30128220 has 48 divisors (see below), whose sum is σ = 93733920. Its totient is φ = 8034048.

The previous prime is 30128209. The next prime is 30128239. The reversal of 30128220 is 2282103.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 30128193 and 30128202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27357 + ... + 28436.

It is an arithmetic number, because the mean of its divisors is an integer number (1952790).

Almost surely, 2^30128220 is an apocalyptic number.

30128220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30128220 is an abundant number, since it is smaller than the sum of its proper divisors (63605700).

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

30128220 is a wasteful number, since it uses less digits than its factorization.

30128220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55811 (or 55803 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 30128220 is about 5488.9179261490. The cubic root of 30128220 is about 311.1652984791.

The spelling of 30128220 in words is "thirty million, one hundred twenty-eight thousand, two hundred twenty".