642484581 has 8 divisors (see below), whose sum is σ = 856876224. Its totient is φ = 428208000.

The previous prime is 642484559. The next prime is 642484627. The reversal of 642484581 is 185484246.

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

It is not a de Polignac number, because 642484581 - 2¹⁵ = 642451813 is a prime.

It is a super-2 number, since 2×642484581² = 825572873645491122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642484181) 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, 14761 + ... + 38766.

It is an arithmetic number, because the mean of its divisors is an integer number (107109528).

Almost surely, 2^642484581 is an apocalyptic number.

It is an amenable number.

642484581 is a deficient number, since it is larger than the sum of its proper divisors (214391643).

642484581 is a wasteful number, since it uses less digits than its factorization.

642484581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57531.

The product of its digits is 245760, while the sum is 42.

The square root of 642484581 is about 25347.2795581696. The cubic root of 642484581 is about 862.8876167431.

The spelling of 642484581 in words is "six hundred forty-two million, four hundred eighty-four thousand, five hundred eighty-one".