642483721 has 8 divisors (see below), whose sum is σ = 705357504. Its totient is φ = 580354320.

The previous prime is 642483707. The next prime is 642483733. The reversal of 642483721 is 127384246.

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 642483721 - 2⁹ = 642483209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642480721) 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, 184285 + ... + 187738.

It is an arithmetic number, because the mean of its divisors is an integer number (88169688).

Almost surely, 2^642483721 is an apocalyptic number.

It is an amenable number.

642483721 is a deficient number, since it is larger than the sum of its proper divisors (62873783).

642483721 is a wasteful number, since it uses less digits than its factorization.

642483721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372191.

The product of its digits is 64512, while the sum is 37.

The square root of 642483721 is about 25347.2625938187. The cubic root of 642483721 is about 862.8872317358.

It can be divided in two parts, 642483 and 721, that added together give a square (643204 = 802²).

The spelling of 642483721 in words is "six hundred forty-two million, four hundred eighty-three thousand, seven hundred twenty-one".