670688720 has 160 divisors (see below), whose sum is σ = 1763887104. Its totient is φ = 235468800.

The previous prime is 670688699. The next prime is 670688729. The reversal of 670688720 is 27886076.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670688729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2288894 + ... + 2289186.

Almost surely, 2^670688720 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 670688720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881943552).

670688720 is an abundant number, since it is smaller than the sum of its proper divisors (1093198384).

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

670688720 is a wasteful number, since it uses less digits than its factorization.

670688720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 670688720 is about 25897.6585814239. The cubic root of 670688720 is about 875.3337371816. Note that the first 3 decimals are identical.

The spelling of 670688720 in words is "six hundred seventy million, six hundred eighty-eight thousand, seven hundred twenty".