30728763 has 36 divisors (see below), whose sum is σ = 48817080. Its totient is φ = 18615168.

The previous prime is 30728749. The next prime is 30728767. The reversal of 30728763 is 36782703.

It is not a de Polignac number, because 30728763 - 2⁶ = 30728699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30728767) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 135256 + ... + 135482.

It is an arithmetic number, because the mean of its divisors is an integer number (1356030).

Almost surely, 2^30728763 is an apocalyptic number.

30728763 is a deficient number, since it is larger than the sum of its proper divisors (18088317).

30728763 is a wasteful number, since it uses less digits than its factorization.

30728763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 30728763 is about 5543.3530466677. The cubic root of 30728763 is about 313.2191879634.

The spelling of 30728763 in words is "thirty million, seven hundred twenty-eight thousand, seven hundred sixty-three".