642689498 has 8 divisors (see below), whose sum is σ = 1051673760. Its totient is φ = 292131580.

The previous prime is 642689479. The next prime is 642689521. The reversal of 642689498 is 894986246.

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

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, 14606558 + ... + 14606601.

It is an arithmetic number, because the mean of its divisors is an integer number (131459220).

Almost surely, 2^642689498 is an apocalyptic number.

642689498 is a deficient number, since it is larger than the sum of its proper divisors (408984262).

642689498 is a wasteful number, since it uses less digits than its factorization.

642689498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29213172.

The product of its digits is 5971968, while the sum is 56.

The square root of 642689498 is about 25351.3214251250. The cubic root of 642689498 is about 862.9793447791.

The spelling of 642689498 in words is "six hundred forty-two million, six hundred eighty-nine thousand, four hundred ninety-eight".