696521978 has 8 divisors (see below), whose sum is σ = 1045046772. Its totient is φ = 348173056.

The previous prime is 696521953. The next prime is 696521989. The reversal of 696521978 is 879125696.

It can be written as a sum of positive squares in 2 ways, for example, as 629658649 + 66863329 = 25093^2 + 8177^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33575 + ... + 50202.

Almost surely, 2^696521978 is an apocalyptic number.

696521978 is a deficient number, since it is larger than the sum of its proper divisors (348524794).

696521978 is a wasteful number, since it uses less digits than its factorization.

696521978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87936.

The product of its digits is 1632960, while the sum is 53.

The square root of 696521978 is about 26391.7028249410. The cubic root of 696521978 is about 886.4310120220.

The spelling of 696521978 in words is "six hundred ninety-six million, five hundred twenty-one thousand, nine hundred seventy-eight".