30797920 has 48 divisors (see below), whose sum is σ = 75932640. Its totient is φ = 11782144.

The previous prime is 30797909. The next prime is 30797939. The reversal of 30797920 is 2979703.

It is a self number, because there is not a number n which added to its sum of digits gives 30797920.

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, 505 + ... + 7864.

It is an arithmetic number, because the mean of its divisors is an integer number (1581930).

Almost surely, 2^30797920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30797920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37966320).

30797920 is an abundant number, since it is smaller than the sum of its proper divisors (45134720).

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

30797920 is a wasteful number, since it uses less digits than its factorization.

30797920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8407 (or 8399 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 30797920 is about 5549.5873720485. The cubic root of 30797920 is about 313.4539850234.

The spelling of 30797920 in words is "thirty million, seven hundred ninety-seven thousand, nine hundred twenty".