30720723 has 8 divisors (see below), whose sum is σ = 44684736. Its totient is φ = 18618600.

The previous prime is 30720719. The next prime is 30720733. The reversal of 30720723 is 32702703.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30720723 - 2² = 30720719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30720693 and 30720702.

It is not an unprimeable number, because it can be changed into a prime (30720733) 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 7 ways as a sum of consecutive naturals, for example, 465433 + ... + 465498.

It is an arithmetic number, because the mean of its divisors is an integer number (5585592).

Almost surely, 2^30720723 is an apocalyptic number.

30720723 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

30720723 is a deficient number, since it is larger than the sum of its proper divisors (13964013).

30720723 is a wasteful number, since it uses less digits than its factorization.

30720723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930945.

The product of its (nonzero) digits is 1764, while the sum is 24.

The square root of 30720723 is about 5542.6278063749. The cubic root of 30720723 is about 313.1918682615.

The spelling of 30720723 in words is "thirty million, seven hundred twenty thousand, seven hundred twenty-three".