642433245 has 16 divisors (see below), whose sum is σ = 1031994432. Its totient is φ = 341264000.

The previous prime is 642433237. The next prime is 642433249. The reversal of 642433245 is 542334246.

It is not a de Polignac number, because 642433245 - 2³ = 642433237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642433249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81552 + ... + 89081.

It is an arithmetic number, because the mean of its divisors is an integer number (64499652).

Almost surely, 2^642433245 is an apocalyptic number.

It is an amenable number.

642433245 is a deficient number, since it is larger than the sum of its proper divisors (389561187).

642433245 is a wasteful number, since it uses less digits than its factorization.

642433245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170892.

The product of its digits is 69120, while the sum is 33.

The square root of 642433245 is about 25346.2668848886. The cubic root of 642433245 is about 862.8646338939.

The spelling of 642433245 in words is "six hundred forty-two million, four hundred thirty-three thousand, two hundred forty-five".