642055456 has 96 divisors (see below), whose sum is σ = 1541877120. Its totient is φ = 256905216.

The previous prime is 642055423. The next prime is 642055459. The reversal of 642055456 is 654550246.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (642055459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528706 + ... + 529918.

It is an arithmetic number, because the mean of its divisors is an integer number (16061220).

Almost surely, 2^642055456 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 642055456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770938560).

642055456 is an abundant number, since it is smaller than the sum of its proper divisors (899821664).

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

642055456 is a wasteful number, since it uses less digits than its factorization.

642055456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386 (or 1378 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 642055456 is about 25338.8132318781. The cubic root of 642055456 is about 862.6954621347.

The spelling of 642055456 in words is "six hundred forty-two million, fifty-five thousand, four hundred fifty-six".