3640979328 has 128 divisors (see below), whose sum is σ = 11151717120. Its totient is φ = 1030987776.

The previous prime is 3640979323. The next prime is 3640979333. The reversal of 3640979328 is 8239790463.

It is an interprime number because it is at equal distance from previous prime (3640979323) and next prime (3640979333).

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640979323) 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, 297751 + ... + 309737.

It is an arithmetic number, because the mean of its divisors is an integer number (87122790).

Almost surely, 2^3640979328 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 3640979328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5575858560).

3640979328 is an abundant number, since it is smaller than the sum of its proper divisors (7510737792).

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

3640979328 is a wasteful number, since it uses less digits than its factorization.

3640979328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12124 (or 12112 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 51.

The square root of 3640979328 is about 60340.5280719352. The cubic root of 3640979328 is about 1538.4122794238.

The spelling of 3640979328 in words is "three billion, six hundred forty million, nine hundred seventy-nine thousand, three hundred twenty-eight".