1642748069 has 4 divisors (see below), whose sum is σ = 1642892940. Its totient is φ = 1642603200.

The previous prime is 1642748057. The next prime is 1642748077. The reversal of 1642748069 is 9608472461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9608472461 = 7 ⋅1372638923.

It can be written as a sum of positive squares in 2 ways, for example, as 739024225 + 903723844 = 27185^2 + 30062^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642748069 - 2²⁸ = 1374312613 is a prime.

It is a super-2 number, since 2×1642748069² = 5397242436406457522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642748099) 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, 53834 + ... + 78635.

It is an arithmetic number, because the mean of its divisors is an integer number (410723235).

Almost surely, 2^1642748069 is an apocalyptic number.

It is an amenable number.

1642748069 is a deficient number, since it is larger than the sum of its proper divisors (144871).

1642748069 is a wasteful number, since it uses less digits than its factorization.

1642748069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144870.

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 1642748069 is about 40530.8286246408. The cubic root of 1642748069 is about 1179.9320244765.

The spelling of 1642748069 in words is "one billion, six hundred forty-two million, seven hundred forty-eight thousand, sixty-nine".