978321530 has 16 divisors (see below), whose sum is σ = 1764083880. Its totient is φ = 390638592.

The previous prime is 978321517. The next prime is 978321563. The reversal of 978321530 is 35123879.

It can be written as a sum of positive squares in 4 ways, for example, as 505215529 + 473106001 = 22477^2 + 21751^2 .

It is a super-2 number, since 2×978321530² = 1914226032123081800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80279 + ... + 91658.

Almost surely, 2^978321530 is an apocalyptic number.

978321530 is a deficient number, since it is larger than the sum of its proper divisors (785762350).

978321530 is a wasteful number, since it uses less digits than its factorization.

978321530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172513.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 978321530 is about 31278.1318176134. The cubic root of 978321530 is about 992.7209878729.

It can be divided in two parts, 9783 and 21530, that added together give a palindrome (31313).

The spelling of 978321530 in words is "nine hundred seventy-eight million, three hundred twenty-one thousand, five hundred thirty".