1642422644 has 6 divisors (see below), whose sum is σ = 2874239634. Its totient is φ = 821211320.

The previous prime is 1642422641. The next prime is 1642422647. The reversal of 1642422644 is 4462242461.

It is an interprime number because it is at equal distance from previous prime (1642422641) and next prime (1642422647).

It can be written as a sum of positive squares in only one way, i.e., 1490886544 + 151536100 = 38612^2 + 12310^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642422641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205302827 + ... + 205302834.

It is an arithmetic number, because the mean of its divisors is an integer number (479039939).

Almost surely, 2^1642422644 is an apocalyptic number.

It is an amenable number.

1642422644 is a deficient number, since it is larger than the sum of its proper divisors (1231816990).

1642422644 is a wasteful number, since it uses less digits than its factorization.

1642422644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410605665 (or 410605663 counting only the distinct ones).

The product of its digits is 73728, while the sum is 35.

The square root of 1642422644 is about 40526.8138890784. The cubic root of 1642422644 is about 1179.8541052986.

The spelling of 1642422644 in words is "one billion, six hundred forty-two million, four hundred twenty-two thousand, six hundred forty-four".