673698816 has 264 divisors, whose sum is σ = 2319496640. Its totient is φ = 189222912.

The previous prime is 673698769. The next prime is 673698821. The reversal of 673698816 is 618896376.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11418595 + ... + 11418653.

Almost surely, 2^673698816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 673698816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159748320).

673698816 is an abundant number, since it is smaller than the sum of its proper divisors (1645797824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

673698816 is an equidigital number, since it uses as much as digits as its factorization.

673698816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 71 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 673698816 is about 25955.7087362299. The cubic root of 673698816 is about 876.6413018407.

The spelling of 673698816 in words is "six hundred seventy-three million, six hundred ninety-eight thousand, eight hundred sixteen".