642794271 has 32 divisors (see below), whose sum is σ = 1038885888. Its totient is φ = 345565440.

The previous prime is 642794227. The next prime is 642794287. The reversal of 642794271 is 172497246.

It is not a de Polignac number, because 642794271 - 2⁹ = 642793759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642794171) 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 31 ways as a sum of consecutive naturals, for example, 18555 + ... + 40371.

It is an arithmetic number, because the mean of its divisors is an integer number (32465184).

Almost surely, 2^642794271 is an apocalyptic number.

642794271 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

642794271 is a deficient number, since it is larger than the sum of its proper divisors (396091617).

642794271 is a wasteful number, since it uses less digits than its factorization.

642794271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21911.

The product of its digits is 169344, while the sum is 42.

The square root of 642794271 is about 25353.3877617963. The cubic root of 642794271 is about 863.0262373155.

The spelling of 642794271 in words is "six hundred forty-two million, seven hundred ninety-four thousand, two hundred seventy-one".