1642775638 has 8 divisors (see below), whose sum is σ = 2816186832. Its totient is φ = 704046696.

The previous prime is 1642775627. The next prime is 1642775639. The reversal of 1642775638 is 8365772461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1642775591 and 1642775600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642775639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58670545 + ... + 58670572.

It is an arithmetic number, because the mean of its divisors is an integer number (352023354).

Almost surely, 2^1642775638 is an apocalyptic number.

1642775638 is a deficient number, since it is larger than the sum of its proper divisors (1173411194).

1642775638 is a wasteful number, since it uses less digits than its factorization.

1642775638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117341126.

The product of its digits is 1693440, while the sum is 49.

The square root of 1642775638 is about 40531.1687223549. The cubic root of 1642775638 is about 1179.9386250755.

The spelling of 1642775638 in words is "one billion, six hundred forty-two million, seven hundred seventy-five thousand, six hundred thirty-eight".