678640473 has 48 divisors (see below), whose sum is σ = 1148958720. Its totient is φ = 377945568.

The previous prime is 678640471. The next prime is 678640489. The reversal of 678640473 is 374046876.

678640473 is a `hidden beast` number, since 67 + 86 + 40 + 473 = 666.

It is not a de Polignac number, because 678640473 - 2¹ = 678640471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678640471) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1240386 + ... + 1240932.

It is an arithmetic number, because the mean of its divisors is an integer number (23936640).

Almost surely, 2^678640473 is an apocalyptic number.

678640473 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

678640473 is a deficient number, since it is larger than the sum of its proper divisors (470318247).

678640473 is a wasteful number, since it uses less digits than its factorization.

678640473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 1023 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The square root of 678640473 is about 26050.7288381726. The cubic root of 678640473 is about 878.7795033757.

The spelling of 678640473 in words is "six hundred seventy-eight million, six hundred forty thousand, four hundred seventy-three".