30733840 has 20 divisors (see below), whose sum is σ = 71456364. Its totient is φ = 12293504.

The previous prime is 30733837. The next prime is 30733877. The reversal of 30733840 is 4833703.

It can be written as a sum of positive squares in 2 ways, for example, as 17073424 + 13660416 = 4132^2 + 3696^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×30733840² = 1889137842291200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30733799 and 30733808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192007 + ... + 192166.

Almost surely, 2^30733840 is an apocalyptic number.

It is an amenable number.

30733840 is an abundant number, since it is smaller than the sum of its proper divisors (40722524).

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

30733840 is a wasteful number, since it uses less digits than its factorization.

30733840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384186 (or 384180 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 30733840 is about 5543.8109635881. The cubic root of 30733840 is about 313.2364370170.

The spelling of 30733840 in words is "thirty million, seven hundred thirty-three thousand, eight hundred forty".