30978 has 12 divisors (see below), whose sum is σ = 67158. Its totient is φ = 10320.

The previous prime is 30977. The next prime is 30983. The reversal of 30978 is 87903.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23409 + 7569 = 153^2 + 87^2 .

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (30971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 843 + ... + 878.

2³⁰⁹⁷⁸ is an apocalyptic number.

30978 is an abundant number, since it is smaller than the sum of its proper divisors (36180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30978 is a wasteful number, since it uses less digits than its factorization.

30978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729 (or 1726 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 30978 is about 176.0056817265. The cubic root of 30978 is about 31.4063735422.

The spelling of 30978 in words is "thirty thousand, nine hundred seventy-eight".