30729528 has 24 divisors (see below), whose sum is σ = 83226000. Its totient is φ = 10243152.

The previous prime is 30729521. The next prime is 30729539. The reversal of 30729528 is 82592703.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×30729528² = 1888607782205568, which contains 22 as substring.

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 = 30729492 and 30729501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30729521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213328 + ... + 213471.

It is an arithmetic number, because the mean of its divisors is an integer number (3467750).

Almost surely, 2^30729528 is an apocalyptic number.

It is an amenable number.

30729528 is an abundant number, since it is smaller than the sum of its proper divisors (52496472).

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

30729528 is a wasteful number, since it uses less digits than its factorization.

30729528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426811 (or 426804 counting only the distinct ones).

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

The square root of 30729528 is about 5543.4220477968. The cubic root of 30729528 is about 313.2217871643.

The spelling of 30729528 in words is "thirty million, seven hundred twenty-nine thousand, five hundred twenty-eight".