30748821 has 16 divisors (see below), whose sum is σ = 43276800. Its totient is φ = 19366128.

The previous prime is 30748793. The next prime is 30748831. The reversal of 30748821 is 12884703.

It is not a de Polignac number, because 30748821 - 2⁵ = 30748789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30748831) 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, 33000 + ... + 33918.

It is an arithmetic number, because the mean of its divisors is an integer number (2704800).

Almost surely, 2^30748821 is an apocalyptic number.

It is an amenable number.

30748821 is a deficient number, since it is larger than the sum of its proper divisors (12527979).

30748821 is a wasteful number, since it uses less digits than its factorization.

30748821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 30748821 is about 5545.1619453358. The cubic root of 30748821 is about 313.2873237357.

The spelling of 30748821 in words is "thirty million, seven hundred forty-eight thousand, eight hundred twenty-one".