678477831 has 8 divisors (see below), whose sum is σ = 905660544. Its totient is φ = 451806840.

The previous prime is 678477817. The next prime is 678477847. The reversal of 678477831 is 138774876.

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

It is not a de Polignac number, because 678477831 - 2⁷ = 678477703 is a prime.

It is a super-2 number, since 2×678477831² = 920664334316929122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678477131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124825 + ... + 130146.

It is an arithmetic number, because the mean of its divisors is an integer number (113207568).

Almost surely, 2^678477831 is an apocalyptic number.

678477831 is a deficient number, since it is larger than the sum of its proper divisors (227182713).

678477831 is a wasteful number, since it uses less digits than its factorization.

678477831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255861.

The product of its digits is 1580544, while the sum is 51.

The square root of 678477831 is about 26047.6070110097. The cubic root of 678477831 is about 878.7092954226.

The spelling of 678477831 in words is "six hundred seventy-eight million, four hundred seventy-seven thousand, eight hundred thirty-one".