642910254 has 64 divisors (see below), whose sum is σ = 1500291072. Its totient is φ = 179877600.

The previous prime is 642910253. The next prime is 642910319. The reversal of 642910254 is 452019246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642910253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497349 + ... + 498639.

It is an arithmetic number, because the mean of its divisors is an integer number (23442048).

Almost surely, 2^642910254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642910254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (750145536).

642910254 is an abundant number, since it is smaller than the sum of its proper divisors (857380818).

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

642910254 is a wasteful number, since it uses less digits than its factorization.

642910254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 642910254 is about 25355.6749860855. The cubic root of 642910254 is about 863.0781410930.

The spelling of 642910254 in words is "six hundred forty-two million, nine hundred ten thousand, two hundred fifty-four".