1642742738 has 48 divisors (see below), whose sum is σ = 3145285080. Its totient is φ = 637588224.

The previous prime is 1642742737. The next prime is 1642742753. The reversal of 1642742738 is 8372472461.

It can be written as a sum of positive squares in 4 ways, for example, as 1492508689 + 150234049 = 38633^2 + 12257^2 .

It is not an unprimeable number, because it can be changed into a prime (1642742737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55358 + ... + 79686.

Almost surely, 2^1642742738 is an apocalyptic number.

1642742738 is a deficient number, since it is larger than the sum of its proper divisors (1502542342).

1642742738 is a wasteful number, since it uses less digits than its factorization.

1642742738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24411 (or 24404 counting only the distinct ones).

The product of its digits is 451584, while the sum is 44.

The square root of 1642742738 is about 40530.7628598328. The cubic root of 1642742738 is about 1179.9307481143.

The spelling of 1642742738 in words is "one billion, six hundred forty-two million, seven hundred forty-two thousand, seven hundred thirty-eight".