642724829 has 8 divisors (see below), whose sum is σ = 664595712. Its totient is φ = 620925120.

The previous prime is 642724801. The next prime is 642724867. The reversal of 642724829 is 928427246.

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

It is a cyclic number.

It is not a de Polignac number, because 642724829 - 2¹⁶ = 642659293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642724829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642724889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 902 + ... + 35864.

It is an arithmetic number, because the mean of its divisors is an integer number (83074464).

Almost surely, 2^642724829 is an apocalyptic number.

It is an amenable number.

642724829 is a deficient number, since it is larger than the sum of its proper divisors (21870883).

642724829 is a wasteful number, since it uses less digits than its factorization.

642724829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35587.

The product of its digits is 387072, while the sum is 44.

The square root of 642724829 is about 25352.0182431301. The cubic root of 642724829 is about 862.9951582031.

The spelling of 642724829 in words is "six hundred forty-two million, seven hundred twenty-four thousand, eight hundred twenty-nine".