6454639872 has 432 divisors, whose sum is σ = 20951490560. Its totient is φ = 1975228416.

The previous prime is 6454639871. The next prime is 6454639879. The reversal of 6454639872 is 2789364546.

6454639872 is a `hidden beast` number, since 6 + 4 + 546 + 3 + 98 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6454639871) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50823873 + ... + 50823999.

Almost surely, 2^6454639872 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 6454639872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10475745280).

6454639872 is an abundant number, since it is smaller than the sum of its proper divisors (14496850688).

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

6454639872 is a wasteful number, since it uses less digits than its factorization.

6454639872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 194 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The square root of 6454639872 is about 80340.7734092721. The cubic root of 6454639872 is about 1861.9042308825.

The spelling of 6454639872 in words is "six billion, four hundred fifty-four million, six hundred thirty-nine thousand, eight hundred seventy-two".