30813500 has 24 divisors (see below), whose sum is σ = 67297776. Its totient is φ = 12325200.

The previous prime is 30813481. The next prime is 30813521. The reversal of 30813500 is 531803.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30314 + ... + 31313.

It is an arithmetic number, because the mean of its divisors is an integer number (2804074).

Almost surely, 2^30813500 is an apocalyptic number.

It is an amenable number.

30813500 is an abundant number, since it is smaller than the sum of its proper divisors (36484276).

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

30813500 is a wasteful number, since it uses less digits than its factorization.

30813500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61646 (or 61634 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 30813500 is about 5550.9909025326. The cubic root of 30813500 is about 313.5068326379.

It can be divided in two parts, 30813 and 500, that added together give a palindrome (31313).

The spelling of 30813500 in words is "thirty million, eight hundred thirteen thousand, five hundred".