642232145 has 8 divisors (see below), whose sum is σ = 771278760. Its totient is φ = 513385600.

The previous prime is 642232141. The next prime is 642232147. The reversal of 642232145 is 541232246.

It can be written as a sum of positive squares in 4 ways, for example, as 17032129 + 625200016 = 4127^2 + 25004^2 .

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

It is not a de Polignac number, because 642232145 - 2² = 642232141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642232141) 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, 42860 + ... + 55869.

It is an arithmetic number, because the mean of its divisors is an integer number (96409845).

Almost surely, 2^642232145 is an apocalyptic number.

It is an amenable number.

642232145 is a deficient number, since it is larger than the sum of its proper divisors (129046615).

642232145 is a wasteful number, since it uses less digits than its factorization.

642232145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100035.

The product of its digits is 11520, while the sum is 29.

The square root of 642232145 is about 25342.2995207617. The cubic root of 642232145 is about 862.7745907192.

The spelling of 642232145 in words is "six hundred forty-two million, two hundred thirty-two thousand, one hundred forty-five".