678738032642 has 32 divisors (see below), whose sum is σ = 1110389729904. Its totient is φ = 309893990400.

The previous prime is 678738032629. The next prime is 678738032677. The reversal of 678738032642 is 246230837876.

It can be written as a sum of positive squares in 8 ways, for example, as 617075281 + 678120957361 = 24841^2 + 823481^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1092713 + ... + 1597340.

Almost surely, 2^678738032642 is an apocalyptic number.

678738032642 is a deficient number, since it is larger than the sum of its proper divisors (431651697262).

678738032642 is a wasteful number, since it uses less digits than its factorization.

678738032642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690294.

The product of its (nonzero) digits is 16257024, while the sum is 56.

The spelling of 678738032642 in words is "six hundred seventy-eight billion, seven hundred thirty-eight million, thirty-two thousand, six hundred forty-two".