642723088 has 20 divisors (see below), whose sum is σ = 1423172800. Its totient is φ = 275452704.

The previous prime is 642723083. The next prime is 642723139. The reversal of 642723088 is 880327246.

It is a self number, because there is not a number n which added to its sum of digits gives 642723088.

It is not an unprimeable number, because it can be changed into a prime (642723083) 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 3 ways as a sum of consecutive naturals, for example, 2869188 + ... + 2869411.

It is an arithmetic number, because the mean of its divisors is an integer number (71158640).

Almost surely, 2^642723088 is an apocalyptic number.

It is an amenable number.

642723088 is an abundant number, since it is smaller than the sum of its proper divisors (780449712).

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

642723088 is a wasteful number, since it uses less digits than its factorization.

642723088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5738614 (or 5738608 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 642723088 is about 25351.9839065900. The cubic root of 642723088 is about 862.9943789811.

The spelling of 642723088 in words is "six hundred forty-two million, seven hundred twenty-three thousand, eighty-eight".