642411215 has 16 divisors (see below), whose sum is σ = 823475808. Its totient is φ = 479410176.

The previous prime is 642411197. The next prime is 642411239. The reversal of 642411215 is 512114246.

It is a cyclic number.

It is not a de Polignac number, because 642411215 - 2⁶ = 642411151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23837 + ... + 43046.

It is an arithmetic number, because the mean of its divisors is an integer number (51467238).

Almost surely, 2^642411215 is an apocalyptic number.

642411215 is a deficient number, since it is larger than the sum of its proper divisors (181064593).

642411215 is a wasteful number, since it uses less digits than its factorization.

642411215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67018.

The product of its digits is 1920, while the sum is 26.

The square root of 642411215 is about 25345.8323004000. The cubic root of 642411215 is about 862.8547708068.

It can be divided in two parts, 64241 and 1215, that added together give a palindrome (65456).

The spelling of 642411215 in words is "six hundred forty-two million, four hundred eleven thousand, two hundred fifteen".