678337631 has 4 divisors (see below), whose sum is σ = 678624672. Its totient is φ = 678050592.

The previous prime is 678337571. The next prime is 678337633. The reversal of 678337631 is 136733876.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678337631 - 2¹⁸ = 678075487 is a prime.

It is a super-2 number, since 2×678337631² = 920283883261384322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678337633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 139946 + ... + 144711.

It is an arithmetic number, because the mean of its divisors is an integer number (169656168).

Almost surely, 2^678337631 is an apocalyptic number.

678337631 is a deficient number, since it is larger than the sum of its proper divisors (287041).

678337631 is a wasteful number, since it uses less digits than its factorization.

678337631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287040.

The product of its digits is 381024, while the sum is 44.

The square root of 678337631 is about 26044.9156458607. The cubic root of 678337631 is about 878.6487660414.

The spelling of 678337631 in words is "six hundred seventy-eight million, three hundred thirty-seven thousand, six hundred thirty-one".