642724676 has 12 divisors (see below), whose sum is σ = 1227019920. Its totient is φ = 292147560.

The previous prime is 642724657. The next prime is 642724679. The reversal of 642724676 is 676427246.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 14607379 = 642724676 / (6 + 4 + 2 + 7 + 2 + 4 + 6 + 7 + 6).

It is not an unprimeable number, because it can be changed into a prime (642724679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7303646 + ... + 7303733.

It is an arithmetic number, because the mean of its divisors is an integer number (102251660).

Almost surely, 2^642724676 is an apocalyptic number.

It is an amenable number.

642724676 is a deficient number, since it is larger than the sum of its proper divisors (584295244).

642724676 is a wasteful number, since it uses less digits than its factorization.

642724676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14607394 (or 14607392 counting only the distinct ones).

The product of its digits is 677376, while the sum is 44.

The square root of 642724676 is about 25352.0152256187. The cubic root of 642724676 is about 862.9950897247.

The spelling of 642724676 in words is "six hundred forty-two million, seven hundred twenty-four thousand, six hundred seventy-six".