30720001 has 4 divisors (see below), whose sum is σ = 33083092. Its totient is φ = 28356912.

The previous prime is 30719987. The next prime is 30720007. The reversal of 30720001 is 10002703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10002703 = 43 ⋅232621.

It can be written as a sum of positive squares in 2 ways, for example, as 1560001 + 29160000 = 1249^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 30720001 - 2⁷ = 30719873 is a prime.

It is a super-2 number, since 2×30720001² = 1887436922880002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 2363077 = 30720001 / (3 + 0 + 7 + 2 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30720007) 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, 1181526 + ... + 1181551.

It is an arithmetic number, because the mean of its divisors is an integer number (8270773).

It is a Proth number, since it is equal to 1875 ⋅ 2¹⁴ + 1 and 1875 < 2¹⁴.

Almost surely, 2^30720001 is an apocalyptic number.

It is an amenable number.

30720001 is a deficient number, since it is larger than the sum of its proper divisors (2363091).

30720001 is a wasteful number, since it uses less digits than its factorization.

30720001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363090.

The product of its (nonzero) digits is 42, while the sum is 13.

The square root of 30720001 is about 5542.5626744314. The cubic root of 30720001 is about 313.1894146918.

Adding to 30720001 its reverse (10002703), we get a palindrome (40722704).

The spelling of 30720001 in words is "thirty million, seven hundred twenty thousand, one".