30055620 has 72 divisors (see below), whose sum is σ = 97905024. Its totient is φ = 6869184.

The previous prime is 30055601. The next prime is 30055621. The reversal of 30055620 is 2655003.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (30055621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2172 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (1359792).

Almost surely, 2^30055620 is an apocalyptic number.

30055620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30055620 is an abundant number, since it is smaller than the sum of its proper divisors (67849404).

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

30055620 is a wasteful number, since it uses less digits than its factorization.

30055620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10249 (or 10240 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 30055620 is about 5482.3006119694. The cubic root of 30055620 is about 310.9151590137.

The spelling of 30055620 in words is "thirty million, fifty-five thousand, six hundred twenty".