30728529 has 48 divisors (see below), whose sum is σ = 52590720. Its totient is φ = 17107200.

The previous prime is 30728527. The next prime is 30728549. The reversal of 30728529 is 92582703.

It is a happy number.

It is not a de Polignac number, because 30728529 - 2¹ = 30728527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30728493 and 30728502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30728521) 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, 50829 + ... + 51429.

It is an arithmetic number, because the mean of its divisors is an integer number (1095640).

Almost surely, 2^30728529 is an apocalyptic number.

30728529 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

30728529 is a deficient number, since it is larger than the sum of its proper divisors (21862191).

30728529 is a wasteful number, since it uses less digits than its factorization.

30728529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 30728529 is about 5543.3319402684. The cubic root of 30728529 is about 313.2183929051.

The spelling of 30728529 in words is "thirty million, seven hundred twenty-eight thousand, five hundred twenty-nine".