642615441 has 8 divisors (see below), whose sum is σ = 922729920. Its totient is φ = 395455632.

The previous prime is 642615431. The next prime is 642615497. The reversal of 642615441 is 144516246.

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

It is not a de Polignac number, because 642615441 - 2⁵ = 642615409 is a prime.

It is a super-3 number, since 3×642615441³ (a number of 27 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642615431) 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, 8238621 + ... + 8238698.

It is an arithmetic number, because the mean of its divisors is an integer number (115341240).

Almost surely, 2^642615441 is an apocalyptic number.

It is an amenable number.

642615441 is a deficient number, since it is larger than the sum of its proper divisors (280114479).

642615441 is a wasteful number, since it uses less digits than its factorization.

642615441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16477335.

The product of its digits is 23040, while the sum is 33.

The square root of 642615441 is about 25349.8607688484. The cubic root of 642615441 is about 862.9461965189.

The spelling of 642615441 in words is "six hundred forty-two million, six hundred fifteen thousand, four hundred forty-one".