642022156 has 12 divisors (see below), whose sum is σ = 1133482392. Its totient is φ = 318170048.

The previous prime is 642022123. The next prime is 642022159. The reversal of 642022156 is 651220246.

It is not an unprimeable number, because it can be changed into a prime (642022159) 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, 709750 + ... + 710653.

It is an arithmetic number, because the mean of its divisors is an integer number (94456866).

Almost surely, 2^642022156 is an apocalyptic number.

It is an amenable number.

642022156 is a deficient number, since it is larger than the sum of its proper divisors (491460236).

642022156 is a wasteful number, since it uses less digits than its factorization.

642022156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420520 (or 1420518 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 642022156 is about 25338.1561286531. The cubic root of 642022156 is about 862.6805474025.

The spelling of 642022156 in words is "six hundred forty-two million, twenty-two thousand, one hundred fifty-six".