30749557 has 4 divisors (see below), whose sum is σ = 30863296. Its totient is φ = 30635820.

The previous prime is 30749531. The next prime is 30749567. The reversal of 30749557 is 75594703.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75594703 = 149 ⋅507347.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30749557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30749507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56463 + ... + 57004.

It is an arithmetic number, because the mean of its divisors is an integer number (7715824).

Almost surely, 2^30749557 is an apocalyptic number.

It is an amenable number.

30749557 is a deficient number, since it is larger than the sum of its proper divisors (113739).

30749557 is a wasteful number, since it uses less digits than its factorization.

30749557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113738.

The product of its (nonzero) digits is 132300, while the sum is 40.

The square root of 30749557 is about 5545.2283090960. The cubic root of 30749557 is about 313.2898233181.

The spelling of 30749557 in words is "thirty million, seven hundred forty-nine thousand, five hundred fifty-seven".