2154536648 has 48 divisors (see below), whose sum is σ = 4479916140. Its totient is φ = 970618880.

The previous prime is 2154536647. The next prime is 2154536651. The reversal of 2154536648 is 8466354512.

It can be written as a sum of positive squares in 2 ways, for example, as 1601440324 + 553096324 = 40018^2 + 23518^2 .

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 2154536599 and 2154536608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154536647) 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, 99536 + ... + 119232.

Almost surely, 2^2154536648 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 2154536648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2239958070).

2154536648 is an abundant number, since it is smaller than the sum of its proper divisors (2325379492).

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

2154536648 is a wasteful number, since it uses less digits than its factorization.

2154536648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19838 (or 19823 counting only the distinct ones).

The product of its digits is 691200, while the sum is 44.

The square root of 2154536648 is about 46416.9866320510. The cubic root of 2154536648 is about 1291.5700387589.

The spelling of 2154536648 in words is "two billion, one hundred fifty-four million, five hundred thirty-six thousand, six hundred forty-eight".