3996738640 has 20 divisors (see below), whose sum is σ = 9292417524. Its totient is φ = 1598695424.

The previous prime is 3996738637. The next prime is 3996738659. The reversal of 3996738640 is 468376993.

It can be written as a sum of positive squares in 2 ways, for example, as 2739894336 + 1256844304 = 52344^2 + 35452^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-4 number, since 4×3996738640⁴ (a number of 40 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24979537 + ... + 24979696.

Almost surely, 2^3996738640 is an apocalyptic number.

It is an amenable number.

3996738640 is an abundant number, since it is smaller than the sum of its proper divisors (5295678884).

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

3996738640 is a wasteful number, since it uses less digits than its factorization.

3996738640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49959246 (or 49959240 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 55.

The square root of 3996738640 is about 63219.7646310076. The cubic root of 3996738640 is about 1586.9695108048.

It can be divided in two parts, 3996738 and 640, that added together give a triangular number (3997378 = T₂₈₂₇).

The spelling of 3996738640 in words is "three billion, nine hundred ninety-six million, seven hundred thirty-eight thousand, six hundred forty".