30121620 has 48 divisors (see below), whose sum is σ = 89304768. Its totient is φ = 7559680.

The previous prime is 30121607. The next prime is 30121621. The reversal of 30121620 is 2612103.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 30121620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13746 + ... + 15785.

It is an arithmetic number, because the mean of its divisors is an integer number (1860516).

Almost surely, 2^30121620 is an apocalyptic number.

30121620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30121620 is an abundant number, since it is smaller than the sum of its proper divisors (59183148).

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

30121620 is a wasteful number, since it uses less digits than its factorization.

30121620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29560 (or 29558 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 30121620 is about 5488.3166818251. The cubic root of 30121620 is about 311.1425751436.

Adding to 30121620 its reverse (2612103), we get a palindrome (32733723).

The spelling of 30121620 in words is "thirty million, one hundred twenty-one thousand, six hundred twenty".