30724978 has 8 divisors (see below), whose sum is σ = 47676780. Its totient is φ = 14832720.

The previous prime is 30724963. The next prime is 30724979. The reversal of 30724978 is 87942703.

It can be written as a sum of positive squares in 2 ways, for example, as 30614089 + 110889 = 5533^2 + 333^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 30724978.

It is not an unprimeable number, because it can be changed into a prime (30724979) 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, 264813 + ... + 264928.

Almost surely, 2^30724978 is an apocalyptic number.

30724978 is a deficient number, since it is larger than the sum of its proper divisors (16951802).

30724978 is a wasteful number, since it uses less digits than its factorization.

30724978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529772.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 30724978 is about 5543.0116362858. The cubic root of 30724978 is about 313.2063272298.

The spelling of 30724978 in words is "thirty million, seven hundred twenty-four thousand, nine hundred seventy-eight".