30561006 has 48 divisors (see below), whose sum is σ = 74856960. Its totient is φ = 8270640.

The previous prime is 30560993. The next prime is 30561017. The reversal of 30561006 is 60016503.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2851 + ... + 8321.

It is an arithmetic number, because the mean of its divisors is an integer number (1559520).

Almost surely, 2^30561006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30561006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37428480).

30561006 is an abundant number, since it is smaller than the sum of its proper divisors (44295954).

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

30561006 is a wasteful number, since it uses less digits than its factorization.

30561006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5509 (or 5502 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 30561006 is about 5528.2009731919. The cubic root of 30561006 is about 312.6481635544.

Adding to 30561006 its reverse (60016503), we get a palindrome (90577509).

The spelling of 30561006 in words is "thirty million, five hundred sixty-one thousand, six".