672630640 has 80 divisors (see below), whose sum is σ = 1764931680. Its totient is φ = 236149760.

The previous prime is 672630631. The next prime is 672630649. The reversal of 672630640 is 46036276.

It is an interprime number because it is at equal distance from previous prime (672630631) and next prime (672630649).

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 672630596 and 672630605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672630649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12342 + ... + 38698.

It is an arithmetic number, because the mean of its divisors is an integer number (22061646).

Almost surely, 2^672630640 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 672630640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882465840).

672630640 is an abundant number, since it is smaller than the sum of its proper divisors (1092301040).

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

672630640 is a wasteful number, since it uses less digits than its factorization.

672630640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26410 (or 26404 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 672630640 is about 25935.1236742762. The cubic root of 672630640 is about 876.1777403218.

The spelling of 672630640 in words is "six hundred seventy-two million, six hundred thirty thousand, six hundred forty".