672389640 has 256 divisors, whose sum is σ = 2447020800. Its totient is φ = 163233792.

The previous prime is 672389629. The next prime is 672389657. The reversal of 672389640 is 46983276.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1165032 + ... + 1165608.

It is an arithmetic number, because the mean of its divisors is an integer number (9558675).

Almost surely, 2^672389640 is an apocalyptic number.

672389640 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 672389640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1223510400).

672389640 is an abundant number, since it is smaller than the sum of its proper divisors (1774631160).

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

672389640 is a wasteful number, since it uses less digits than its factorization.

672389640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 672389640 is about 25930.4770492176. The cubic root of 672389640 is about 876.0730845385.

The spelling of 672389640 in words is "six hundred seventy-two million, three hundred eighty-nine thousand, six hundred forty".