1642744731 has 32 divisors (see below), whose sum is σ = 2446329600. Its totient is φ = 974453760.

The previous prime is 1642744687. The next prime is 1642744757. The reversal of 1642744731 is 1374472461.

It is not a de Polignac number, because 1642744731 - 2⁶ = 1642744667 is a prime.

It is a super-2 number, since 2×1642744731² = 5397220502456524722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1642744731.

It is not an unprimeable number, because it can be changed into a prime (1642744031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 551815 + ... + 554783.

It is an arithmetic number, because the mean of its divisors is an integer number (76447800).

Almost surely, 2^1642744731 is an apocalyptic number.

1642744731 is a deficient number, since it is larger than the sum of its proper divisors (803584869).

1642744731 is a wasteful number, since it uses less digits than its factorization.

1642744731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579.

The product of its digits is 112896, while the sum is 39.

The square root of 1642744731 is about 40530.7874460884. The cubic root of 1642744731 is about 1179.9312252840.

The spelling of 1642744731 in words is "one billion, six hundred forty-two million, seven hundred forty-four thousand, seven hundred thirty-one".