670664736 has 144 divisors (see below), whose sum is σ = 2294510400. Its totient is φ = 181522944.

The previous prime is 670664719. The next prime is 670664749. The reversal of 670664736 is 637466076.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×670664736² = 899582376227899392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 670664691 and 670664700.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 29550 + ... + 47058.

It is an arithmetic number, because the mean of its divisors is an integer number (15934100).

Almost surely, 2^670664736 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 670664736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1147255200).

670664736 is an abundant number, since it is smaller than the sum of its proper divisors (1623845664).

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

670664736 is a wasteful number, since it uses less digits than its factorization.

670664736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17551 (or 17540 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 45.

The square root of 670664736 is about 25897.1955238400. The cubic root of 670664736 is about 875.3233030045.

The spelling of 670664736 in words is "six hundred seventy million, six hundred sixty-four thousand, seven hundred thirty-six".