673774856640 has 448 divisors, whose sum is σ = 2505553536000. Its totient is φ = 169977139200.

The previous prime is 673774856617. The next prime is 673774856641. The reversal of 673774856640 is 46658477376.

673774856640 is a `hidden beast` number, since 67 + 3 + 7 + 7 + 4 + 8 + 566 + 4 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673774856641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 136086165 + ... + 136091115.

Almost surely, 2^673774856640 is an apocalyptic number.

673774856640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 673774856640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1252776768000).

673774856640 is an abundant number, since it is smaller than the sum of its proper divisors (1831778679360).

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

673774856640 is a wasteful number, since it uses less digits than its factorization.

673774856640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5825 (or 5809 counting only the distinct ones).

The product of its (nonzero) digits is 142248960, while the sum is 63.

The spelling of 673774856640 in words is "six hundred seventy-three billion, seven hundred seventy-four million, eight hundred fifty-six thousand, six hundred forty".