642722229 has 16 divisors (see below), whose sum is σ = 955071040. Its totient is φ = 427181040.

The previous prime is 642722219. The next prime is 642722237. The reversal of 642722229 is 922227246.

642722229 is a `hidden beast` number, since 6 + 427 + 2 + 2 + 229 = 666.

It is not a de Polignac number, because 642722229 - 2⁸ = 642721973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642722193 and 642722202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642722209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27022 + ... + 44895.

It is an arithmetic number, because the mean of its divisors is an integer number (59691940).

Almost surely, 2^642722229 is an apocalyptic number.

It is an amenable number.

642722229 is a deficient number, since it is larger than the sum of its proper divisors (312348811).

642722229 is a wasteful number, since it uses less digits than its factorization.

642722229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72257 (or 72251 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 642722229 is about 25351.9669651094. The cubic root of 642722229 is about 862.9939945167.

The spelling of 642722229 in words is "six hundred forty-two million, seven hundred twenty-two thousand, two hundred twenty-nine".