3953691648 has 132 divisors (see below), whose sum is σ = 11839766120. Its totient is φ = 1317814272.

The previous prime is 3953691629. The next prime is 3953691689. The reversal of 3953691648 is 8461963593.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 3953691594 and 3953691603.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240888 + ... + 256776.

Almost surely, 2^3953691648 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 3953691648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5919883060).

3953691648 is an abundant number, since it is smaller than the sum of its proper divisors (7886074472).

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

3953691648 is an equidigital number, since it uses as much as digits as its factorization.

3953691648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15924 (or 15894 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 3953691648 is about 62878.3877655908. The cubic root of 3953691648 is about 1581.2514317703.

The spelling of 3953691648 in words is "three billion, nine hundred fifty-three million, six hundred ninety-one thousand, six hundred forty-eight".