642646246 has 12 divisors (see below), whose sum is σ = 1059570036. Its totient is φ = 292111820.

The previous prime is 642646241. The next prime is 642646261.

642646246 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 642646199 and 642646208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642646241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1327540 + ... + 1328023.

It is an arithmetic number, because the mean of its divisors is an integer number (88297503).

Almost surely, 2^642646246 is an apocalyptic number.

642646246 is a deficient number, since it is larger than the sum of its proper divisors (416923790).

642646246 is a wasteful number, since it uses less digits than its factorization.

642646246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655587 (or 2655576 counting only the distinct ones).

The product of its digits is 331776, while the sum is 40.

The square root of 642646246 is about 25350.4683585925. The cubic root of 642646246 is about 862.9599852906.

The spelling of 642646246 in words is "six hundred forty-two million, six hundred forty-six thousand, two hundred forty-six".