30747649 has 4 divisors (see below), whose sum is σ = 30765636. Its totient is φ = 30729664.

The previous prime is 30747641. The next prime is 30747671. The reversal of 30747649 is 94674703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94674703 = 463 ⋅204481.

It can be written as a sum of positive squares in 2 ways, for example, as 16459249 + 14288400 = 4057^2 + 3780^2 .

It is a cyclic number.

It is not a de Polignac number, because 30747649 - 2³ = 30747641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30747641) 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, 6124 + ... + 9949.

It is an arithmetic number, because the mean of its divisors is an integer number (7691409).

Almost surely, 2^30747649 is an apocalyptic number.

It is an amenable number.

30747649 is a deficient number, since it is larger than the sum of its proper divisors (17987).

30747649 is a wasteful number, since it uses less digits than its factorization.

30747649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17986.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 30747649 is about 5545.0562666216. The cubic root of 30747649 is about 313.2833433402.

The spelling of 30747649 in words is "thirty million, seven hundred forty-seven thousand, six hundred forty-nine".