642604001 has 4 divisors (see below), whose sum is σ = 692035092. Its totient is φ = 593172912.

The previous prime is 642603989. The next prime is 642604009. The reversal of 642604001 is 100406246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 230310976 + 412293025 = 15176^2 + 20305^2 .

It is a cyclic number.

It is not a de Polignac number, because 642604001 - 2²² = 638409697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642604009) 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, 24715526 + ... + 24715551.

It is an arithmetic number, because the mean of its divisors is an integer number (173008773).

Almost surely, 2^642604001 is an apocalyptic number.

It is an amenable number.

642604001 is a deficient number, since it is larger than the sum of its proper divisors (49431091).

642604001 is a wasteful number, since it uses less digits than its factorization.

642604001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49431090.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 642604001 is about 25349.6351255792. The cubic root of 642604001 is about 862.9410756942.

The spelling of 642604001 in words is "six hundred forty-two million, six hundred four thousand, one".