678881990 has 8 divisors (see below), whose sum is σ = 1221987600. Its totient is φ = 271552792.

The previous prime is 678881981. The next prime is 678881999. The reversal of 678881990 is 99188876.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (678881981) and next prime (678881999).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678881999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33944090 + ... + 33944109.

It is an arithmetic number, because the mean of its divisors is an integer number (152748450).

Almost surely, 2^678881990 is an apocalyptic number.

678881990 is a deficient number, since it is larger than the sum of its proper divisors (543105610).

678881990 is a wasteful number, since it uses less digits than its factorization.

678881990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67888206.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The square root of 678881990 is about 26055.3639391201. The cubic root of 678881990 is about 878.8837387429.

The spelling of 678881990 in words is "six hundred seventy-eight million, eight hundred eighty-one thousand, nine hundred ninety".