30723661 has 4 divisors (see below), whose sum is σ = 30735292. Its totient is φ = 30712032.

The previous prime is 30723631. The next prime is 30723701. The reversal of 30723661 is 16632703.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16632703 = 23 ⋅723161.

It can be written as a sum of positive squares in 2 ways, for example, as 25857225 + 4866436 = 5085^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 30723661 - 2⁷ = 30723533 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 (30723611) 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, 271 + ... + 7843.

It is an arithmetic number, because the mean of its divisors is an integer number (7683823).

Almost surely, 2^30723661 is an apocalyptic number.

It is an amenable number.

30723661 is a deficient number, since it is larger than the sum of its proper divisors (11631).

30723661 is an equidigital number, since it uses as much as digits as its factorization.

30723661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11630.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 30723661 is about 5542.8928367776. The cubic root of 30723661 is about 313.2018520584.

The spelling of 30723661 in words is "thirty million, seven hundred twenty-three thousand, six hundred sixty-one".