642261215 has 8 divisors (see below), whose sum is σ = 770897088. Its totient is φ = 513686560.

The previous prime is 642261211. The next prime is 642261229. The reversal of 642261215 is 512162246.

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

It is not a de Polignac number, because 642261215 - 2² = 642261211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642261211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12314 + ... + 37896.

It is an arithmetic number, because the mean of its divisors is an integer number (96362136).

Almost surely, 2^642261215 is an apocalyptic number.

642261215 is a deficient number, since it is larger than the sum of its proper divisors (128635873).

642261215 is a wasteful number, since it uses less digits than its factorization.

642261215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30609.

The product of its digits is 5760, while the sum is 29.

The square root of 642261215 is about 25342.8730612770. The cubic root of 642261215 is about 862.7876080677.

The spelling of 642261215 in words is "six hundred forty-two million, two hundred sixty-one thousand, two hundred fifteen".