2154990464 has 128 divisors (see below), whose sum is σ = 4907628000. Its totient is φ = 933560320.

The previous prime is 2154990401. The next prime is 2154990511. The reversal of 2154990464 is 4640994512.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3633752 + ... + 3634344.

Almost surely, 2^2154990464 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 2154990464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2453814000).

2154990464 is an abundant number, since it is smaller than the sum of its proper divisors (2752637536).

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

2154990464 is a wasteful number, since it uses less digits than its factorization.

2154990464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 2154990464 is about 46421.8748436553. The cubic root of 2154990464 is about 1291.6607147132.

The spelling of 2154990464 in words is "two billion, one hundred fifty-four million, nine hundred ninety thousand, four hundred sixty-four".