642754926 has 144 divisors (see below), whose sum is σ = 1625418288. Its totient is φ = 188956800.

The previous prime is 642754913. The next prime is 642754943. The reversal of 642754926 is 629457246.

642754926 is a `hidden beast` number, since 64 + 27 + 549 + 26 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8804826 + ... + 8804898.

It is an arithmetic number, because the mean of its divisors is an integer number (11287627).

Almost surely, 2^642754926 is an apocalyptic number.

642754926 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 642754926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812709144).

642754926 is an abundant number, since it is smaller than the sum of its proper divisors (982663362).

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

642754926 is an equidigital number, since it uses as much as digits as its factorization.

642754926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 150 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 642754926 is about 25352.6118181145. The cubic root of 642754926 is about 863.0086285400.

The spelling of 642754926 in words is "six hundred forty-two million, seven hundred fifty-four thousand, nine hundred twenty-six".