30933640 has 16 divisors (see below), whose sum is σ = 69600780. Its totient is φ = 12373440.

The previous prime is 30933631. The next prime is 30933667. The reversal of 30933640 is 4633903.

It can be written as a sum of positive squares in 2 ways, for example, as 30669444 + 264196 = 5538^2 + 514^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30933599 and 30933608.

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, 386631 + ... + 386710.

Almost surely, 2^30933640 is an apocalyptic number.

It is an amenable number.

30933640 is an abundant number, since it is smaller than the sum of its proper divisors (38667140).

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

30933640 is a wasteful number, since it uses less digits than its factorization.

30933640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773352 (or 773348 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 28.

The square root of 30933640 is about 5561.8018663020. The cubic root of 30933640 is about 313.9137523951.

The spelling of 30933640 in words is "thirty million, nine hundred thirty-three thousand, six hundred forty".