6453639408 has 80 divisors (see below), whose sum is σ = 17641728000. Its totient is φ = 2027266560.

The previous prime is 6453639383. The next prime is 6453639449. The reversal of 6453639408 is 8049363546.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 155668 + ... + 192716.

It is an arithmetic number, because the mean of its divisors is an integer number (220521600).

Almost surely, 2^6453639408 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 6453639408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8820864000).

6453639408 is an abundant number, since it is smaller than the sum of its proper divisors (11188088592).

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

6453639408 is a wasteful number, since it uses less digits than its factorization.

6453639408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37270 (or 37264 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 48.

The square root of 6453639408 is about 80334.5467902820. The cubic root of 6453639408 is about 1861.8080280247.

The spelling of 6453639408 in words is "six billion, four hundred fifty-three million, six hundred thirty-nine thousand, four hundred eight".