3651687648 has 72 divisors (see below), whose sum is σ = 11867991408. Its totient is φ = 1043338752.

The previous prime is 3651687647. The next prime is 3651687707. The reversal of 3651687648 is 8467861563.

3651687648 is a `hidden beast` number, since 3 + 6 + 516 + 87 + 6 + 48 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 3651687594 and 3651687603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3651687647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 903661 + ... + 907692.

It is an arithmetic number, because the mean of its divisors is an integer number (164833214).

Almost surely, 2^3651687648 is an apocalyptic number.

It is an amenable number.

3651687648 is an abundant number, since it is smaller than the sum of its proper divisors (8216303760).

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

3651687648 is a wasteful number, since it uses less digits than its factorization.

3651687648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811376 (or 1811365 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 3651687648 is about 60429.1953280862. The cubic root of 3651687648 is about 1539.9189882611.

It can be divided in two parts, 365168 and 7648, that added together give a triangular number (372816 = T₈₆₃).

The spelling of 3651687648 in words is "three billion, six hundred fifty-one million, six hundred eighty-seven thousand, six hundred forty-eight".