642976489 has 8 divisors (see below), whose sum is σ = 650124288. Its totient is φ = 635861520.

The previous prime is 642976447. The next prime is 642976493. The reversal of 642976489 is 984679246.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 642976489 - 2¹³ = 642968297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642976289) 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, 32274 + ... + 48244.

It is an arithmetic number, because the mean of its divisors is an integer number (81265536).

Almost surely, 2^642976489 is an apocalyptic number.

It is an amenable number.

642976489 is a deficient number, since it is larger than the sum of its proper divisors (7147799).

642976489 is a wasteful number, since it uses less digits than its factorization.

642976489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16415.

The product of its digits is 5225472, while the sum is 55.

The square root of 642976489 is about 25356.9810703088. The cubic root of 642976489 is about 863.1077792461.

The spelling of 642976489 in words is "six hundred forty-two million, nine hundred seventy-six thousand, four hundred eighty-nine".