3964698640 has 80 divisors (see below), whose sum is σ = 10589643648. Its totient is φ = 1352245248.

The previous prime is 3964698611. The next prime is 3964698643. The reversal of 3964698640 is 468964693.

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

It is not an unprimeable number, because it can be changed into a prime (3964698643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89739 + ... + 126421.

Almost surely, 2^3964698640 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 3964698640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5294821824).

3964698640 is an abundant number, since it is smaller than the sum of its proper divisors (6624945008).

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

3964698640 is a wasteful number, since it uses less digits than its factorization.

3964698640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36896 (or 36890 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 55.

The square root of 3964698640 is about 62965.8529680969. The cubic root of 3964698640 is about 1582.7174620691.

The spelling of 3964698640 in words is "three billion, nine hundred sixty-four million, six hundred ninety-eight thousand, six hundred forty".