642220754 has 12 divisors (see below), whose sum is σ = 1120609854. Its totient is φ = 275237424.

The previous prime is 642220753. The next prime is 642220771. The reversal of 642220754 is 457022246.

It can be written as a sum of positive squares in only one way, i.e., 631165129 + 11055625 = 25123^2 + 3325^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642220754.

It is not an unprimeable number, because it can be changed into a prime (642220753) 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 5 ways as a sum of consecutive naturals, for example, 3276539 + ... + 3276734.

Almost surely, 2^642220754 is an apocalyptic number.

642220754 is a deficient number, since it is larger than the sum of its proper divisors (478389100).

642220754 is a wasteful number, since it uses less digits than its factorization.

642220754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6553289 (or 6553282 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 642220754 is about 25342.0747769396. The cubic root of 642220754 is about 862.7694897997.

The spelling of 642220754 in words is "six hundred forty-two million, two hundred twenty thousand, seven hundred fifty-four".