642340245 has 16 divisors (see below), whose sum is σ = 1029816000. Its totient is φ = 341890944.

The previous prime is 642340241. The next prime is 642340249. The reversal of 642340245 is 542043246.

It is an interprime number because it is at equal distance from previous prime (642340241) and next prime (642340249).

It is not a de Polignac number, because 642340245 - 2² = 642340241 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642340241) 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, 35424 + ... + 50393.

It is an arithmetic number, because the mean of its divisors is an integer number (64363500).

Almost surely, 2^642340245 is an apocalyptic number.

It is an amenable number.

642340245 is a deficient number, since it is larger than the sum of its proper divisors (387475755).

642340245 is a wasteful number, since it uses less digits than its factorization.

642340245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86324.

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 642340245 is about 25344.4322287953. The cubic root of 642340245 is about 862.8229951794.

The spelling of 642340245 in words is "six hundred forty-two million, three hundred forty thousand, two hundred forty-five".