30725217 has 16 divisors (see below), whose sum is σ = 47498880. Its totient is φ = 19592496.

The previous prime is 30725197. The next prime is 30725221. The reversal of 30725217 is 71252703.

It is not a de Polignac number, because 30725217 - 2⁶ = 30725153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30725287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24118 + ... + 25359.

It is an arithmetic number, because the mean of its divisors is an integer number (2968680).

Almost surely, 2^30725217 is an apocalyptic number.

It is an amenable number.

30725217 is a deficient number, since it is larger than the sum of its proper divisors (16773663).

30725217 is a wasteful number, since it uses less digits than its factorization.

30725217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49509 (or 49503 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 30725217 is about 5543.0331949214. The cubic root of 30725217 is about 313.2071393390.

The spelling of 30725217 in words is "thirty million, seven hundred twenty-five thousand, two hundred seventeen".