678440090 has 8 divisors (see below), whose sum is σ = 1221192180. Its totient is φ = 271376032.

The previous prime is 678440069. The next prime is 678440101. The reversal of 678440090 is 90044876.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 660130249 + 18309841 = 25693^2 + 4279^2 .

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

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, 33921995 + ... + 33922014.

Almost surely, 2^678440090 is an apocalyptic number.

678440090 is a deficient number, since it is larger than the sum of its proper divisors (542752090).

678440090 is a wasteful number, since it uses less digits than its factorization.

678440090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67844016.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 678440090 is about 26046.8825389911. The cubic root of 678440090 is about 878.6930020962.

The spelling of 678440090 in words is "six hundred seventy-eight million, four hundred forty thousand, ninety".