1651867648 has 32 divisors (see below), whose sum is σ = 3303750420. Its totient is φ = 825917440.

The previous prime is 1651867639. The next prime is 1651867649. The reversal of 1651867648 is 8467681561.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 1651867595 and 1651867604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651867649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7563 + ... + 57973.

Almost surely, 2^1651867648 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 1651867648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1651875210).

1651867648 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1651867648 is an frugal number, since it uses more digits than its factorization.

1651867648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50441 (or 50413 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The square root of 1651867648 is about 40643.1746791512. The cubic root of 1651867648 is about 1182.1114279455. Note that the first 3 decimals are identical.

The spelling of 1651867648 in words is "one billion, six hundred fifty-one million, eight hundred sixty-seven thousand, six hundred forty-eight".