30743928 has 64 divisors (see below), whose sum is σ = 85860000. Its totient is φ = 10192896.

The previous prime is 30743927. The next prime is 30743941. The reversal of 30743928 is 82934703.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 30743892 and 30743901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30743927) 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, 68248 + ... + 68696.

Almost surely, 2^30743928 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 30743928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42930000).

30743928 is an abundant number, since it is smaller than the sum of its proper divisors (55116072).

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

30743928 is a wasteful number, since it uses less digits than its factorization.

30743928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 30743928 is about 5544.7207323724. The cubic root of 30743928 is about 313.2707052537.

The spelling of 30743928 in words is "thirty million, seven hundred forty-three thousand, nine hundred twenty-eight".