30750749 has 4 divisors (see below), whose sum is σ = 30867936. Its totient is φ = 30633564.

The previous prime is 30750743. The next prime is 30750761. The reversal of 30750749 is 94705703.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30750749 is a prime.

It is a super-2 number, since 2×30750749² = 1891217128122002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30750743) 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 3 ways as a sum of consecutive naturals, for example, 58199 + ... + 58724.

It is an arithmetic number, because the mean of its divisors is an integer number (7716984).

Almost surely, 2^30750749 is an apocalyptic number.

It is an amenable number.

30750749 is a deficient number, since it is larger than the sum of its proper divisors (117187).

30750749 is a wasteful number, since it uses less digits than its factorization.

30750749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117186.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 30750749 is about 5545.3357878491. The cubic root of 30750749 is about 313.2938714701.

The spelling of 30750749 in words is "thirty million, seven hundred fifty thousand, seven hundred forty-nine".