670021680 has 160 divisors (see below), whose sum is σ = 2223232704. Its totient is φ = 166330368.

The previous prime is 670021619. The next prime is 670021687. The reversal of 670021680 is 86120076.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (670021687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 394914 + ... + 396606.

Almost surely, 2^670021680 is an apocalyptic number.

670021680 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 670021680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111616352).

670021680 is an abundant number, since it is smaller than the sum of its proper divisors (1553211024).

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

670021680 is a wasteful number, since it uses less digits than its factorization.

670021680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1817 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 670021680 is about 25884.7769934377. The cubic root of 670021680 is about 875.0434503593.

The spelling of 670021680 in words is "six hundred seventy million, twenty-one thousand, six hundred eighty".