30743820 has 144 divisors (see below), whose sum is σ = 102120480. Its totient is φ = 7676928.

The previous prime is 30743819. The next prime is 30743827. The reversal of 30743820 is 2834703.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30743827) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 155962 + ... + 156158.

It is an arithmetic number, because the mean of its divisors is an integer number (709170).

Almost surely, 2^30743820 is an apocalyptic number.

30743820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30743820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51060240).

30743820 is an abundant number, since it is smaller than the sum of its proper divisors (71376660).

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

30743820 is a wasteful number, since it uses less digits than its factorization.

30743820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 30743820 is about 5544.7109933702. The cubic root of 30743820 is about 313.2703384249.

The spelling of 30743820 in words is "thirty million, seven hundred forty-three thousand, eight hundred twenty".