642615442 has 8 divisors (see below), whose sum is σ = 1101626496. Its totient is φ = 275406612.

The previous prime is 642615431. The next prime is 642615497. The reversal of 642615442 is 244516246.

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

It is a junction number, because it is equal to n+sod(n) for n = 642615398 and 642615407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22950538 + ... + 22950565.

It is an arithmetic number, because the mean of its divisors is an integer number (137703312).

Almost surely, 2^642615442 is an apocalyptic number.

642615442 is a deficient number, since it is larger than the sum of its proper divisors (459011054).

642615442 is a wasteful number, since it uses less digits than its factorization.

642615442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45901112.

The product of its digits is 46080, while the sum is 34.

The square root of 642615442 is about 25349.8607885724. The cubic root of 642615442 is about 862.9461969665.

The spelling of 642615442 in words is "six hundred forty-two million, six hundred fifteen thousand, four hundred forty-two".