642735233 has 8 divisors (see below), whose sum is σ = 751637568. Its totient is φ = 538103664.

The previous prime is 642735193. The next prime is 642735257. The reversal of 642735233 is 332537246.

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

It is not a de Polignac number, because 642735233 - 2¹⁴ = 642718849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642735193 and 642735202.

It is not an unprimeable number, because it can be changed into a prime (642735263) 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, 1067366 + ... + 1067967.

It is an arithmetic number, because the mean of its divisors is an integer number (93954696).

Almost surely, 2^642735233 is an apocalyptic number.

It is an amenable number.

642735233 is a deficient number, since it is larger than the sum of its proper divisors (108902335).

642735233 is a wasteful number, since it uses less digits than its factorization.

642735233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135383.

The product of its digits is 90720, while the sum is 35.

The square root of 642735233 is about 25352.2234330640. The cubic root of 642735233 is about 862.9998147076. Note that the first 3 decimals are identical.

The spelling of 642735233 in words is "six hundred forty-two million, seven hundred thirty-five thousand, two hundred thirty-three".