30121760 has 24 divisors (see below), whose sum is σ = 71163036. Its totient is φ = 12048640.

The previous prime is 30121759. The next prime is 30121769. The reversal of 30121760 is 6712103.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28858384 + 1263376 = 5372^2 + 1124^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (30121769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93971 + ... + 94290.

Almost surely, 2^30121760 is an apocalyptic number.

It is an amenable number.

30121760 is an abundant number, since it is smaller than the sum of its proper divisors (41041276).

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

30121760 is a wasteful number, since it uses less digits than its factorization.

30121760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188276 (or 188268 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 30121760 is about 5488.3294361764. The cubic root of 30121760 is about 311.1430571882.

Adding to 30121760 its reverse (6712103), we get a palindrome (36833863).

The spelling of 30121760 in words is "thirty million, one hundred twenty-one thousand, seven hundred sixty".