681384478 has 8 divisors (see below), whose sum is σ = 1027428480. Its totient is φ = 338908320.

The previous prime is 681384461. The next prime is 681384491. The reversal of 681384478 is 874483186.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 891483 + ... + 892246.

It is an arithmetic number, because the mean of its divisors is an integer number (128428560).

Almost surely, 2^681384478 is an apocalyptic number.

681384478 is a deficient number, since it is larger than the sum of its proper divisors (346044002).

681384478 is a wasteful number, since it uses less digits than its factorization.

681384478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783922.

The product of its digits is 1032192, while the sum is 49.

The square root of 681384478 is about 26103.3422764212. The cubic root of 681384478 is about 879.9623253499.

The spelling of 681384478 in words is "six hundred eighty-one million, three hundred eighty-four thousand, four hundred seventy-eight".