642671007 has 8 divisors (see below), whose sum is σ = 934794240. Its totient is φ = 389497560.

The previous prime is 642670969. The next prime is 642671017. The reversal of 642671007 is 700176246.

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

It is not a de Polignac number, because 642671007 - 2⁸ = 642670751 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 19474879 = 642671007 / (6 + 4 + 2 + 6 + 7 + 1 + 0 + 0 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642671017) 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, 9737407 + ... + 9737472.

It is an arithmetic number, because the mean of its divisors is an integer number (116849280).

Almost surely, 2^642671007 is an apocalyptic number.

642671007 is a deficient number, since it is larger than the sum of its proper divisors (292123233).

642671007 is a wasteful number, since it uses less digits than its factorization.

642671007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19474893.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 642671007 is about 25350.9567275083. The cubic root of 642671007 is about 862.9710683594.

The spelling of 642671007 in words is "six hundred forty-two million, six hundred seventy-one thousand, seven".