642673741 has 4 divisors (see below), whose sum is σ = 663405184. Its totient is φ = 621942300.

The previous prime is 642673699. The next prime is 642673747. The reversal of 642673741 is 147376246.

642673741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 147376246 = 2 ⋅73688123.

It is a cyclic number.

It is not a de Polignac number, because 642673741 - 2²¹ = 640576589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642673694 and 642673703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642673747) 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, 10365675 + ... + 10365736.

It is an arithmetic number, because the mean of its divisors is an integer number (165851296).

Almost surely, 2^642673741 is an apocalyptic number.

It is an amenable number.

642673741 is a deficient number, since it is larger than the sum of its proper divisors (20731443).

642673741 is a wasteful number, since it uses less digits than its factorization.

642673741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20731442.

The product of its digits is 169344, while the sum is 40.

The square root of 642673741 is about 25351.0106504652. The cubic root of 642673741 is about 862.9722920854.

The spelling of 642673741 in words is "six hundred forty-two million, six hundred seventy-three thousand, seven hundred forty-one".