678212457 has 32 divisors (see below), whose sum is σ = 1000352640. Its totient is φ = 406149120.

The previous prime is 678212453. The next prime is 678212471. The reversal of 678212457 is 754212876.

678212457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 678212457 - 2² = 678212453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678212453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 229294 + ... + 232232.

It is an arithmetic number, because the mean of its divisors is an integer number (31261020).

Almost surely, 2^678212457 is an apocalyptic number.

It is an amenable number.

678212457 is a deficient number, since it is larger than the sum of its proper divisors (322140183).

678212457 is a wasteful number, since it uses less digits than its factorization.

678212457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113.

The product of its digits is 188160, while the sum is 42.

The square root of 678212457 is about 26042.5124939972. The cubic root of 678212457 is about 878.5947168770.

The spelling of 678212457 in words is "six hundred seventy-eight million, two hundred twelve thousand, four hundred fifty-seven".