3291389640 has 640 divisors, whose sum is σ = 14050713600. Its totient is φ = 671224320.

The previous prime is 3291389611. The next prime is 3291389663. The reversal of 3291389640 is 469831923.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 19708837 + ... + 19709003.

It is an arithmetic number, because the mean of its divisors is an integer number (21954240).

Almost surely, 2^3291389640 is an apocalyptic number.

3291389640 is a gapful number since it is divisible by the number (30) 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 3291389640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7025356800).

3291389640 is an abundant number, since it is smaller than the sum of its proper divisors (10759323960).

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

3291389640 is a wasteful number, since it uses less digits than its factorization.

3291389640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 3291389640 is about 57370.6339515261. The cubic root of 3291389640 is about 1487.5095613160.

The spelling of 3291389640 in words is "three billion, two hundred ninety-one million, three hundred eighty-nine thousand, six hundred forty".