642735010 has 8 divisors (see below), whose sum is σ = 1156923036. Its totient is φ = 257094000.

The previous prime is 642734971. The next prime is 642735017. The reversal of 642735010 is 10537246.

It can be written as a sum of positive squares in 2 ways, for example, as 624150289 + 18584721 = 24983^2 + 4311^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 642735010.

It is not an unprimeable number, because it can be changed into a prime (642735017) 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, 32136741 + ... + 32136760.

Almost surely, 2^642735010 is an apocalyptic number.

642735010 is a deficient number, since it is larger than the sum of its proper divisors (514188026).

642735010 is a wasteful number, since it uses less digits than its factorization.

642735010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64273508.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 642735010 is about 25352.2190350273. The cubic root of 642735010 is about 862.9997149003. Note that the first 3 decimals are identical.

The spelling of 642735010 in words is "six hundred forty-two million, seven hundred thirty-five thousand, ten".