672345856 has 288 divisors, whose sum is σ = 1831424000. Its totient is φ = 243855360.

The previous prime is 672345827. The next prime is 672345881. The reversal of 672345856 is 658543276.

It is an alternating number because its digits alternate between even and odd.

Its product of digits (1209600) is a multiple of the sum of its prime divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21688561 + ... + 21688591.

Almost surely, 2^672345856 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 672345856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (915712000).

672345856 is an abundant number, since it is smaller than the sum of its proper divisors (1159078144).

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

672345856 is a wasteful number, since it uses less digits than its factorization.

672345856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 72 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 46.

The square root of 672345856 is about 25929.6327779627. The cubic root of 672345856 is about 876.0540683738.

It can be divided in two parts, 672 and 345856, that added together give a triangular number (346528 = T₈₃₂).

The spelling of 672345856 in words is "six hundred seventy-two million, three hundred forty-five thousand, eight hundred fifty-six".