730978 has 4 divisors (see below), whose sum is σ = 1096470. Its totient is φ = 365488.

The previous prime is 730973. The next prime is 730993. The reversal of 730978 is 879037.

730978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879037 = 23 ⋅38219.

It can be written as a sum of positive squares in only one way, i.e., 552049 + 178929 = 743^2 + 423^2 .

It is not an unprimeable number, because it can be changed into a prime (730973) by changing a digit.

730978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182743 + ... + 182746.

2⁷³⁰⁹⁷⁸ is an apocalyptic number.

730978 is a deficient number, since it is larger than the sum of its proper divisors (365492).

730978 is a wasteful number, since it uses less digits than its factorization.

730978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365491.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 730978 is about 854.9725141781. The cubic root of 730978 is about 90.0813256674.

The spelling of 730978 in words is "seven hundred thirty thousand, nine hundred seventy-eight".